Here’s another one, I didn’t have a watch and only had a flip phone back in college, too. I got pretty good at estimating the time based on shadows thrown by poles or trees and north. I joked (and won one bet, at least) that I could tell the time to within a 10 minutes increments. I mean, that’s not super challenging, now that I think about it again, due to the hourly schedule you’re already on at college. But, hey, it’s one of those goofy and ridiculous things you joke with your friends about.