The meanest thing I've ever done...
Well, I'm a really really nice person and I try to bend over backwards (figure of speech, newbz) to be nice and help people...
but...
I've done some mean things.
When my little brother and sister were young (4 and 6), I used to play an "assassin" game with them: I'd have them run down a longish hall and I'd try to "assassinate" them with the couch cushions.
You have to throw the couch cushions "edge" on and hit them right in the back of the head as they run down the hall. It would then cause them to fly forwards, face first. It was quite funny. And, I'd miss 9 out of 10 times. So the kids would go for it as they would rub it in when I didn't knock them over. But, when I got them, they'd bawl their little eyes out and I'd convince them to go again.
It was mean because I laughed so hard when they went flying and hurt themselves. 🙁 But, what are big brothers for, right? awesome