A Candy Cash Saga

I work in a small video rental store almost outside of the city borders, so we have only a small amount of money in the till at a time. A customer is buying candy.

Me: “Okay, so it is €1 and 80 cents.”

The customer hands me €100. We just had some trouble with some customers using fake notes so we can’t take bigger than €20.

Me: “I’m sorry, I can’t take these big notes.”

Customer: “So, the candy is free, then?”

Me: *Confused* “Why should it be?”

Customer: “I have money but you won’t accept it! I should get it free, then!”

Me: “I’m sorry, I don’t have enough money to give you back. We have a policy to not take larger than twenties. Do you have another form of payment?”

Customer: “Oh… I think I have… Oh, yes, I have a card.”