Don't add any inflection at the end of your sentences, implying that you will say something any moment and creating awkward silences.
Finish all your sentences with "In accordance with prophesy".
Reply to anything anyone else says with "That's what you think."
Signal a conversation is over by clapping your hands over your ears and running away.

My friends and I only do this to each other, but we walk up behind someone, very quietly, get as close as we can and whisper "Can I be the big spoon?". Works best when using a deep voice.

I suppose that this is more of a real life thread, but I found a way to mess with people in WoW. Pretty simple, all you have to do is find a box or something to hide behind in a crowded city and type "/e picks your pocket for 1 gold 45 silver." If you put in believable increments of money the more likely they'll fall for it.

When your at someone else's house at a party go into the rooms that they say not to enter, probably their parent's bedroom, and throw opened condoms around used if your prefer but make it so its not obvious whether you did "anything" with them. They won't know whether or not to pick them up if they even go into that room before their parents get home.

kawligia:
Get on their computer and make an image of their desktop with all their icons in place. Then set that image as their desktop and delete or move all their icons.

Now that is creative!! What a fantastic idea, I have to do that to my mother, she will go crazy!

cthulhu257:
Go to a store, buy a bottle of KY jelly, and stand there holding it, looking contemplative. Yes, I read XKCD.

Did I throw you out of a store a few years back? Seriously, I walked into an aisle and there was a guy taking a drop of each type of lubricant that we had (incidentally- this is a drug store, not adult books) and rubbing his fingers together with it. So I guess this is a win for how to screw with people.

Change the location in all desktop short cuts to ---> shutdown -s -t 60 -c " " <---
This will on Windows XP cause the computer to start a 60 second timer that will shut the computer down and cannot be stopped unless you have this code ---> shutdown -a <--- in either a shortcut or in the Run box.

---> and <--- are start and end points of the code and not part of it.

Start randomly yelling swears and see how many look at you :P

Either.

When someone asks you 'have you got the time?' You look at your watch and you say 'Yeah'. Then Walk away.

OR.

In a club, maintain eye contact with someone, widen your eyes, then hip thrust twice to the left, then twice to the right, and vice versa, moving forward as you do. If they run, well it's expected.

If they stay and are interested, well Billy, you've probably got yourself a whore/mental patient!

while walking in a hallway when no ones looking, pu some tape on each wall, then when you see those peices of tape, stop and then pretend to tep over something, then everyone behind you thinks that there is something there and will step over it too.

recipe for awesome

When somebody comes to sit next to you on a bus, just pat the seat and smile at them.

I carry a small teaspoon around with me in my inside coat pocket. Whenever someone asks to borrow a pen or something, I just take out the spoon and say, "No but I have a spoon?"

Kick them in the balls and mutilate them.

Oh right, psychologically?

Wait until they hit you a little and pretend to be seriously hurt.

the1ultimate:
Don't add any inflection at the end of your sentences, implying that you will say something any moment and creating awkward silences.
Finish all your sentences with "In accordance with prophesy".
Reply to anything anyone else says with "That's what you think."
Signal a conversation is over by clapping your hands over your ears and running away.

I love you. Seriously.

There are more than enough ways to mess with people. The Comedy genre of Hollywood has made that abundantly clear. There are not enough creative methods devised to appreciate or compliment people.

Steal someones wallet and replace their money with monopoly money.
Also put a card in there that states "I know where you live".
Put wallet back in persons pocket.
This works best if you are in or approaching a store of some kind.

My friend in maths kept looking at my other friend who was across the room and she kept seeing her looking as she looked the other would look away we then convinced my friend she was seeing things and going mad, we had to tell her when she was about to try :/

I placed a wireless speaker in the office of my schools nun. I started playing very holy music through it. She got scared.

Also I once filled someone's locker with paint filled condoms. Works a treat.

Also i love to mess with people in shops by giving them advice and when they ask me if I work there (they always do) just looking completely deadpan and going "Oh I don't work here Im just stalking the cashier"

Spectre39:
I suppose that this is more of a real life thread, but I found a way to mess with people in WoW. Pretty simple, all you have to do is find a box or something to hide behind in a crowded city and type "/e picks your pocket for 1 gold 45 silver." If you put in believable increments of money the more likely they'll fall for it.

Spoiler: Click to View

Fuckin' hilarious!

D4zZ:
Turning all the clocks forward afew hours when they have to get up early for work or anything important. Alot of effort if you have alot of computers ect but well funny.

The old screenshot desktops a goodun.

If your still in school, slightly unplugging someones mouse is funny once or twice.

oooo pressing "alt + shift + print screen" on a windows machine makes it go into high contrast mode. Funny at school where most Teachers dont know about it either and just blame the pupils computer you did it on.

Im in computer mode right now so can only think of computery ways to mess with people :P
+ I miss school.

---

Edit: Dont really think these are messing with people but...

Wadders:
A "mate" of mine had a really creepy ability to randomly vomit in public.

I can do that, ive also taught others howto. If you can fake a burp by like breathing air into your stomache, (Not explained very well but its commen, sure you know what I mean) then you just burp it out but keep pushin. Usually your sick within 5/10 seconds of pushin.

I can also fart with my eye. I have no fucking idea how to explain how I do this, and never met anyone else who can, nor have I been able to teach it. Kinda pull the eyelids out and trap air in then push it out it makes a farty noise. Dunno how I found that out and ive worked out how to do high pitch/low pitch aswell :)

God I feel like a kid right now.

I've done that try to burp thing and end up puking before...

It's really gross because you either full on puke or it just ends up in your mouth and burns.

Bah.

OT: I can make my eyes twitch spasmodically (the actual eye, not eyelids) so my pupils are vibrating back and forth really, really fast, I have no idea what it looks like, but it freaks the hell out of some people I know.

Biek:
If someone is walking behind you, stop and pretend your stepping over an invisible wire. With a little luck the person will stop where you did it and look around for a tripwire.

Have you seen the episode of Green Wing where they do that in the office? It's fantastic!

Get a friend and stand either side of a road, and every time a car comes pretend to pull on an invisible rope between you. Then see how many cars slow down when you pull the "rope" tight.
Also works with people instead of cars.

kawligia:
Get on their computer and make an image of their desktop with all their icons in place. Then set that image as their desktop and delete or move all their icons.

You should be worshipped for that idea.
Anyways, there are two things me and my friends do.
Two of my friends are a very deep sleepers. One time when they fell asleep and the rest of us are awake, we laid one of them on top of the other and placed some empty beer cans by them. Their reactions when they woke up were priceless.
The other thing was when one of my friends was in an open-topped shower. We got about ten freezing cold water bombs and chucked them over at him.
Another thing to do is tell someone you know someone fancies them, and them not tell them who.

EDIT: Tie loads of string from one side of a corridor to another. The reactions you get when people walk into it are great.

the1ultimate:

Reply to anything anyone else says with "That's what you think."

i did that to this annoying girl way back in 5th grade all day

she fucking hated me after it

it was quite a hoot though

I found a great way to mess with people. Start a thread dissing the rest of the world as weak-willed, and lacking a backbone. Sure got to a bunch of people.

As a Security Guard at a very boring location...the amounts of ways I have messed with people I cant even remember them all.

When theres hoodlums afoot either biking or skateboarding in the parking lot best thing to do sneak up on them and be like HEY WHATS UP...scares the shit out of em.

Another thing I have done is ill get in my car speed up towards them stop and get out they usually look scared shitless then im just hey guys cant do that on parking lot and then speed off.

There is just to many fun things to do as a Security Guard.

I'm still surprised nobody posted this yet:

go "BEWARE THE FLYING FROG FLINGING FLUBOJIMAJIDGE RUN FOR YOUR LIVE PEOPLE CAN NO ONE SEE THE CHEESE MONKEY AAAARAGARGARAGRARGRRGRGGGGGGGGGGGGGGGGGGGGGG!!!!!!!!!!!!!!!!!!!!!!!!!(then you start flailing around on the floor, vomit or urinate at this point if you feel you need to) pick up a wheelie bin and throw it in a river and jump on it for use as a raft, then say"WE MUST FLEEEEEEEEEEEEEEEEEEEEEEEEEE!!!!!!!" get out and run towards a coffee shop, smash the coffe cups on your hea and run back to where you started, if that doesn't leave a trail of horrified confusion everywhere, then you will be put in an asylum, but I defy anyone to not be freaked out if they seen this, I mean I would be

(p.s this is one of my randomness posts)

i got a good one but it only works probs 1/day
text either a family member or a really close friend & just say "its okay, I'm safe" then turn your phone off for ages.
better if you call them & then in the middle of talking have someone burst a paper bag full of air & then stop talking so it sounds like you've been shot...
that seriously freaks ppl out

Rascarin:
Pulling out a flip-knife in public and pulling it across your bare skin. People really freak out when you do that.

In retrospect, I can't remember why I did that...

Improvement: Get out a secretly BLUNT switchblade and cause yourself multiple non-existent injuries in public.

this one requires some guts and some equipment, I will never do it, but it just came to mind, and it seems awesome.

get some friends that play guitar, bass, vocals and drums, and set all the amps and the drum kit up somewhere crowded, where a lot of people are and start playing non-mainstream music, like Metallica, Iron Maiden etc etc, and see how many people are going to flee, and how many are going to stay.

Not sure if anyone else can do this but I have a lazy eye, which means when I focus my eyes with my glasses off the one eye goes towards the centre, like i'm cross-eyed in one eye. However, it looks completely normal when I don't focus my eyes, so I can freak people out by focusing and unfocusing my eyes over and over, making my one eye go left, right, left, right. I've won many a staring contest with that trick.

get access to one of your friend's computers, go to the desktop, then create a new file called "HOT GAY PORN" or whatever you want that you think would bring offence to your friend. take all the icons off his desktop and put them in the folder, then take a screenshot. find the screenshot then set it as the desktop background, then move all the files out of the "HOT GAY PORN" folder and arrange them on the desktop like they were before. When your friend returns (hopefully after you're gone) he will find that he has a folder on his desktop that he can't remove or delete called "HOT GAY PORN".

Touch yourself, roll your eyes back so they're showing the whites and moan.

Giving a random stranger a high five, and telling them "I just gave you cancer" right afterwards.