No matter who you are people enjoy screwing with other peoples heads. Let's hear some tales of making other people question their grip on reality.

My personal favorite is standing in the middle of a crowded area (indoors is best) and stare very intently upwards. It works even better with a friend who tries to look really interested.

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...

Stare directly ahead in an area that people will notice you. When they make eye contact, lick your lips very very slowly while maintaining that eye contact. That will mess them up.

Smoke bombs in crowded areas

start a religion thread.

What I like to do is go on a night out with my friends and take a carrot with you, THATS RIGHT I SAID A CARROT. Get you friend to the point where he/she is being sick, and while they are being sick rub their back, as you are doing this slowly bring the carrot over their shoulder, during being sick people close their eyes, as your friend does this drop it over his/her shuolder and wait for the look on their face.

By the way, if you can get the same friend mmore than once, they will go to the doctors, belive me it's hilarious!

Point up into the sky and say "Look at all those dead birds!"

People will look up.

Start having a convulsion in the middle of a crowded area. Vomit helps.

Also,

Darth Pope:
stand in the middle of a crowded area (indoors is best) and stare very intently upwards. It works even better with a friend who tries to look really interested.

This.

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

Just blurt out "Hey, look at that." People will be confused and/or scared.

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.

When someone asks a serious question that they want an answer to, just reply with "I'LL tell you..." and then turn around and walk away. :D

Also, locking peoples threads without an explination. o.o

If you see someone sitting on a bench, then sit down on the opposite side of the bench. Then start moving towards that person inch by inch. It's hilarious!

--Xvito, keeping it excellent.

I usually give people wrong directions.

Grin your widest, most insincere grin, and slowly tilt your head to one side, as far as it can go.

This is called the foil man trick.
THIS CAN BE DANGEROUS, I do not encourage anyone to do this

Get 4 + friends, and alot of tin foil( I mean alot), and wrap each other in tin foil,and unwrap one friend and put the tin foil together (to make a fake "Tin man" and choose a road with a small traffic of cars. When a car approaches walk in sight of the car, just to kinda piss them off. Now 20+ feet have one tin man hold the fake one and as the car drives by throw the fake tin man at the car so that they hit it.
I promise they will freak the shit out.

During class, stare at a friend with a look of mock anger. Stare until he stares back. After ten or fifteen seconds, slowly lick your lips, mock anger intact.

Cover the uhm 'opening' of a toilet with Saran Wrap in such a way that you can't notice it. Wait till someone takes a crap on said toilet and, although messy and disgusting, the situation will be hilarious.

Cant give you any from personal experience, as I'm not self confident enough to make an ass of myself on purpose :(

A "mate" of mine had a really creepy ability to randomly vomit in public. If that wasn't weird enough, it was often strange colors, like blue and red :S Fuck knows what he had been eating...

He also slashed a classmate with a pencil sharpener blade once, but thats another story...

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.

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.

In a public area just look up, and keep looking up. People will gather and look up. It's great.

quiet_samurai:
Point up into the sky and say "Look at all those dead birds!"

People will look up.

I'm going to tell my little sister to do that on the fourth of july.

The master at work.

In a public place, just walk around talking about random things, to noone. Or just walk up to random people and say something completely off the wall, like " I like cookies " or " The voices told me to talk to you " when enough people are staring at you, yell "You all are just jealous the Voices talk to ME!"

A good thing to do if you can pull it off is to stare intensly into the distance so other people will turn and look aswell, then move really close upto them so that when they turn round
HELLO!!!

Or, when they're turned away, move off to a different angle to them and try and sneak round to the area you were staring at, so that when they turn to search for you, and see you there, you can claim you've teleported or something equally odd

While driving, signal someone to pull over then keep driving when they do.

George Carlin FTW.

REM. I am a lucid dreamer and can do it whilst awake.

When someone's driving really close behind you, use the break. But very gently, so that the warning-lights go on. People will hit the brake as hard as possible.

Or pointing and saying "I just ate that sandwich"

D4zZ:
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 :)

You're partly a soulmate of mine. I can clap my hands in a really specific way; I hold my palm facing up to the sky, then jam it forward so my fingers 'clap' against my palm. If I do this with two hands at a time and add in a particular way of walking, I look kind of like a lobster. Doing this at random moments can mess with people as well.

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.

Yell Bomb in Public
Dance in the middle of a street. Preferably the Chicken Dance.

Malicious:
Go commando in a crowded area...............on second thought that wont make em frustrated,just amazed and confused.......nevermind me....

Lol I C what you did there.

Standing by yourself, saying "Stop it!" and batting away at air, like you're hitting someone to stop touching you.

Go to a store and carry around a kitchen knife, bags of ice and plastic garbage bags. Works better if you have someone with you that looks stressed/paranoid.

Evil Jak:
When someone asks a serious question that they want to, just reply with "I'LL tell you..." and then turn around and walk away. :D

I do that all the time to teachers. No wonder they didn't like me!