I was going to give one of my crazy storys-- but cynical's can't be topped!!! I'm still laughing.
*(warning-- a bit gross)*
I'd have to say, there were a number of things I've done, but my most famous moment was when I broke into the abf's car, found his stash of 'coke', brought it upstairs, (it was wrapped in a 10$ bill), I gently unwrapped it, dumped the coke and the ten dollar bill into the toilet, went pee---and didn't flush.
went back to bed, Waited for him to have to go to the bathroom. Then I heard "CESSY-- why is there money in our toilet!??"
I said, "I pee'd on your stash-- want a straw?"
Gross, but he was so shocked that i did that that even he laughed!!!