Find someone sitting on a chair and move it and they'll slip out and fall on their asses. Sometimes people get mad at you for it, sometimes they don't. Telekinesis is a good way to do it.
First discovered it by doing it on accident to the cursed/wounded Paladin in Arx and a passing guard shouts "Hey stop that!" LOL Nope!
I wonder if this was deliberately designed or just an emergent property? Either way it's funny.