What is the most fucked up thing you have done to someone?

Took a pack of my friends cigarettes, there were only 3 left, i grabbed the cigs and stuck them in between my ass cheeks, farted a few times while they soaked up my ass sweat and i put them back. He was confused when the 4 of us laughed the minute he put them in his mouth. I hate him, but lulz were heard. Oh i also fucked my girlfriend in his new Dodge Nitro, the thing had 400 miles on it when he let me have it for the night in exchange for picking him up at the bar. That fat shit didn't even get to christen his own car.
 
I once destroyed my uncle's valuable comics collection for no other reason than he was an asshole and I felt like being a dick. I'm sorry it doesn't involve feces.