Pleasant Surprise

Every year I give my father baked goods in a snowman tin.  Every year he gives the tin back in January and I put it in the basement until next year.  This year when I opened it, there was a $100 bill in the top! My father doesn't remember doing it and I can't remember if I stuck it in there for some reason while the snowman was in the car, but whatever the reason, I have a hundred extra dollars!