There's always a moment of awkwardness when you pay with a $5 bill that has writing on it. It's there when a store clerk gives you a $5 bill with handwriting on it as well. You don't really want to take it, but you kind of have to because you know that you'll give it to someone else and they'll also have to take it. It's never something normal written on the bill either. You don't get someone's name or phone number, it says something like "Duel Money" or "Car Drop Off" -- you read it and think, "Man, that doesn't make sense in any context."