I chaperoned a couple of student trips. Once in Mexico, I had to go yank a pretty young blonde out of a disco at 1:30. I was pissed.
Then in Europe, this idiot 18 year old sandy brown haired girl goes wandering off after saying she wouldn't, and ended up getting stuck at the end of the subways by herself on the 1st day in one of the capitals at 1:30 am. (This must be a witching hour internationally.) Some kind soul stuck her in a taxi, paid for the fare, and sent her back to the hotel, thank God. She was told in no uncertain terms that if she tried anything else, she'd be going home on the next plane. We had no more problems with her.
And no, before anyone suggests, these were not my daughters.