My cousin likes to tell the tale about one time when he had had a little ok waaay too much to drink at a party (with other members of the club) at his house one Friday night. The next morning they get up with wicked hangovers and realize that one of the partygoers had left. Complete horror crosses their minds when they realize that that person would have been just crazy enough to go to the saturday morning class that was being offered at the time. Invisioning the amount of trouble they would be in if their instructor found out that they didn't go to class because of a hang over, they all groaned and dragged themselves to class.
Well, now my instructor, clearly recognizing the signs of a person suffering from a really painful hangover made sure it was one of the loudest classes he'd ever taught, thwapping paddles together, yelling at them, and ensuring that they realized that while getting drunk enough to have a hang over was bad enough, coming to class with said hang over was something they'd never ever even think of doing again.