trollrat
Remote administration tool used for trolling a computer user. If you install it, you can do weird things to someone's computer while they use it, like inverting the screen, moving the mouse on it's own, typing random things in the keyboard, run any program you choose, make the screen look like it's melting, and a few other things. It's very similar to the MEMZ trojan, except it won't overwrite your MBR and replace it with a Nyan cat, and you can activate the payloads at will (well, that can also be done with the safe version of MEMZ).
I installed TrollRAT on my teacher's computer, it was so hilarious when it spawned error messages, and making it look like their computer was broken.