Yeah, just forget about it. It's too long ago.
Although I might not be one to speak since one of my roommates last year was an egotistical jerk who bullied others. Even after talking to him one-on-one numerous times to try to get him to stop, he wouldn't.
So for revenge, I used his toothbrush to clean the toilet, poured toilet water in his mouthwash, spat into his shampoo every morning, poured lab bacteria in his food, poured water into his $600 LCD TV, super glued his GameCube controllers shut, stole money from his secret hiding spots (he would hide them in his shoes lol), keyed his car, and shoved him against the wall while threatening to mess him up.
Now, he's scared of me and literally runs away anytime he sees me. I guess I'm not a very nice guy either but this guy really was a cocky douchebag with Napoleon Complex (his name was also David, therefore, since everyone was taller than him, he felt the need to take on this entire world of Goliaths). I guess this makes him sound more pathetic then cruel. In the end, though, he was the biggest coward because he refused to acknowledge himself even after I tried telling him to stop for his own good.
My actions don't make me any better but at least I gave him some justice for all the cruel injustice he caused for other people.