This one time I was driving around and I picked up this girl and we drove around for a bit. Whilst driving the streets at around 70mph I hit a few people with my car, and although it was an accident I actually enjoyed it. We drove to a place where no one could see us then made passionate love. I then gave her some money to see her on her way then got out my car and sliced her to death with a katana whilst shouting derogatory things at her. Once she was dead I took my money back and drove off only to find that the police were on my tail. I managed to get into my friends garage though and spray paint my car, I then left as quick as I could. Funnily enough the police stopped chasing me after that, and I had actually gotten away with it!
So anyway, after that my friend came to my door so I saved the game and turned off my Xbox :P
On a serious note, the worst thing I've ever done is too explicit for Pokecommunity so I think I'll just slowly back out of this thread :D