So I just finished my shift today, and as usual December 26th was very very busy.
There was one point where our box line went out the door (which shows some real determination given that it was below freezing) and all 9 cashiers in concessions had lines of ~10 people.
Anyway, during one of the larger rushes I was getting a little bit miserable, having a lot of idiots, having to make 600000 snack packs, et cetera.
One woman, clearly a mother, after completing her order, said, "Do they let you guys have tip jars?" I said no, unfortunately, it's against policy.
She then proceeded to slip me a 10 dollar bill. I told her I couldn't accept it but she just said "Accept it? Oh no, I just left it there by accident. Merry Christmas."
She then made sure to ask me if I was in school (I am) and said, "Good, then you won't have to work here too much longer."
That just made me happy. Even one good customer can make your day after a whole pile of terrible ones.