Yesterday seemed to be my lucky day because I found a $20 bill on the ground. Part of me wanted to keep it, but part of me wondered who it belonged to. I found it in a bathroom shared by only a few people, so I had a chance of finding the owner... who probably would have ended up blaming some innocent student of stealing it, if I hadn't returned it!
Lesson reminder for today: do unto others as you would have them do unto you.