Any Experiment

[Junkle]

I would go for.. ehm...
Geez.
This is taking some thought.

I'd probably create some sort of super-disease that I'd end up using to unite the world after it is nearly destroyed. Something like World War Z.
Yeah, I'm a little crazy.

 

[Trifixion]

I would attempt to determine whether or not blondes actually do have more fun.

 

[EMFCRACKSHOT]

It's already been done before - (Not for the faint-hearted)

http://en.wikipedia.org/wiki/Unit_731

I don't think anything can beat that.

Neither do I.

For the record, these are the kinds of things i would do, only i would include genetic manipulation in an attempt to create the ultimate human.

 

[Daemascus]

An FTL drive of some kind.