What were you surprised your student didn't know AFTER getting to college?

Oh good if there was a thread last year…I must’ve missed it as I was on here last year! If you find it please do post:-)

There was this thread but it doesn’t really include surprises of something your kid did after the fact…but a good list as well.
http://talk.collegeconfidential.com/parents-forum/1738170-last-thing-to-teach-your-senior-before-he-she-leaves-for-college-p1.html