A guy walks into a bar and asks for a beer "That'll be five dollars", says the bartender, and the guy throws 20 quarters onto the floor. Reluctantly, the bartender picks up the coins and serves the beer.

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The next day, the guy comes into the bar, asks for a beer, throws 20 quarters onto the floor, etc.

The next day, again.

On the fourth day, he asks for a beer, and hands the bartender a 10$ bill. The bartender takes advantage of his chance for revenge, throws 20 quarters onto the floor and yells "here's your change asshole!"

The guy looks down at the coins and says: "I'll have another beer, please."