Money Scam

Riddle: A man walks into a bar and buys 4 kegs of beer for 20 dollars. He leaves the bar without spending a single penny, how did he do this?

Answer: He paid a 20 dollar bill. Source: https://riddles.com/index.php/4837

A man walks into a bar and buys 4 kegs of beer for 20 dollars. He leaves the bar without spending a single penny, how did he do this? — Money Scam by bobs Riddle