The student is usually happier to have that it seems since they get to say "I fought the law and the law didn't win" to their friends and classmates. The teacher does look like an idiot to the class after that though.

It may well come a time when I make the same mistake but at that point I'll be excited to admit I was wrong and restore credit. I'm not ashamed at failing myself, only know-it-all-do-nothings are afraid of ruining their street cred.