Make feathered beds for everyone--and include bed bugs carrying Class 4 hemorrhagic fever causing virus. Mortality rate 85%.
Put tiny little mind control bots in there!
Make a salad that gives all the world leaders irritable bowel syndrome!
A tacky Hawaiian t-shirt
Make a pattern on the T-Shirt that kills anyone just by looking at it except you.
Google Blit. Awesome short story. :-D
Inflict nasty paper cuts on everyone!
A rotten rowing oar.
Having it shoved up someone's nose will be even worse!
Have it chew faces off due to fingerprint recognition.
That's easy. To conquer the Earth, I will use SCIENCE!
An empty paper cup.
Perfect shape to be stuffed into a person's throat.
The nuclear weapon arsenal of the United States.
BOMB THIS PLANET.
I will do that magic trick Joker used in The Dark Knight to everyone!
A nail clipper
Making exploding ones.