i used to break stuff all the time from clumsiness. ive gotten better though. there were a few times it was on purpose though. once i was trying to kick this guy who had hit me at school, i had my steel toe boots on, and he jumped out of the way. i ended up putting my foot thru the metal door on one of the lockers. also, i have broken a couple of guys noses
they deserved it tho' lol