When I was a student I normally did something regrettable if I got drunk. I'm unwilling to descend into detail concerning entire categories of regrettable drunken behavior:

(1) Attempted seductions (embarrassing)
(2) Successful seductions (sometimes more embarrassing)
(3) Waking up in an unfamiliar place with no recollection of how I got there. I'm not unwilling to go into detail on this one, I'm unable.
(4) Driving (distilled idiocy)

I once fell a loooong way from a steep river bank and landed on a very large, flat stone. Didn't feel a thing.

During my first year in college, I got into a fistfight with my roommate. We laughed about it the next day. Morons.

I once climbed a billboard while blitzed. Later that evening I scaled a water tower.