I have too many.
Okay, when I was 18, I lived with this girl(strictly plutonic) and she had her room, and I slept on the couch in the living room. She had a cat that she didn't let stay in her room because it was afraid of her snoring, and the cat used to wake me up like crazy in the middle of the night looking for affection. I put it into the bathroom one night, and it just meowed, so that didn't work. Her bedroom door was hollow, and I ended up drilling a hole in the top when she wasn't home, and I put $30 worth of catnip into her door.
When she came home, she went to her room and and noticed the cat by her door, she was surprised to see it wanting to go in her room, and she would let it in, then the cat would just lay by the door from the inside, looking like it wanted to get out. That drove my roomate crazy, as she never knew why the cat wanted to go in and out, and I never told her. That thing used to meow until the door was open and scratch on the door for hours every damn day. It's one of the funniest things I have ever done.
When I was 6, I glued my Grandpa's pool balls together on the pool table with superglue and lined them up, ready for break. He drank quite a bit, and didn't catch on on his first try, when the balls didn't move. Then he put some english on the cue and hit that sucker as hard as he could. The damn cue ball bounced back and hit him square in the face. I couldn't stop laughing for a day, and I couldn't tell anyone, or I'd get in trouble. But everyone found out eventually and I got my ass whipped good for that, but it was worth it.