I get a giant cat

I steal your top hat and fancy goggles, and therefore your very pimposity. The shame kills you.

I shove that damned burger down your throat. The shock of finally eating the thing causes your heart to explode inside your chest.

I stuff you in the enormous clip on the bottom of my minigun and tape the trigger down

I shoot you with a dart gun. Then feed you to an elephant

I pretend your a cyborg then due to me being a cyborg slayer I kill you with a E.M.P blast brought on by me blinking

I cut your hands (paws?) off therefor making it very, very hard to use that gun and then I stab you, job complete

I lock you outside. Combined with the cold weather and that armor, you suffer severe hypothermia/frostbite and die.

Last of the Chinchillas:
I lock you outside. Combined with the cold weather and that armor, you suffer severe hypothermia/frostbite and die.

you obviously dont know about monster hunter hot drinks, but for the sake of my own death lets say I forgot them...

I genetically clone you to make another chinchilla since you both thought you were the last you commit suicide out of embarrassment

I pump my self so full of steroids that a single punch sends you flying through three walls, out into traffic, where you are hit by a truck.

I do the same except minus the steroids and get the same result

I headshot you with an arrow and get the "William Tell Overkill" achievement.

Since you are nothing but a metal disc, I melt you down and turn you into a spoon.

I cut you to shreds with razor bugs.

I throw you into a lead vat full of hydrochloric acid, as I hate Star Wars.

I rip your intestines out for not knowing it's from Dr. Who.
^{I have never seen Dr. Who, but I know what a dalek is.}

I kill you with DDS--Desu Deficiency Syndrome

I poison your 'food'.

I blow your guts out with a blunderbuss, followed by blowing the building up.

I smother you to death with packing peanuts.

I use the power of Styrofoam to scare you so much, you die.

The use of Styrofoam makes the world's eco system unstable. Mech Godzilla eats you

get 25 kills then use my tactical nuke woooosh!

I frame you for the murder of Batman's parents. 'Nough said

I sic the Joker on you, this should be fun to watch.

I sic my frozen water beast on you! ZAP!

I drown you in a river of fruit loops cereal.

... Ok... I point out that you have been standing in snow for quite a while now. You freeze to death.

I light you on fire and you burn to death.

I...oh, how the hell am I supposed to kill a ninja cat? It's a cat AND a ninja? This is bullshit, I'm outta here...

*storms off*

I use my ninja skills to sneak up behind you and place a kick-me sign on your back. You are then kicked... To death.

I see you in VATS. I then blow your head off, and like a chicken, you run around with blood squirting from your neck for several seconds.

I use the groovitron from the Ratchet & Clank series on you and you keep dancing until you die from exhaustion.

Illogical death. In Power armor, the armor does the work for you...But whatever...

I grab a powerfist, and yell "FALCOOON PAAAAAWNCH!". THe fist hits you in the face so accurately that not even good ninja skills could dodge. Your are teleported onto a large skyscraper, where momentum takes you straight of the edge where you fall to your death.

Well, cats always land on their feet so I would still die but I would look kind of cool as I did.

Anyway, I summon an army of baby sea lions to trample you to death.