A guy goes into a bar and has a couple of beers. Once he is done the bartender tells him he owes $6.00.
"But I paid, don't you remember?" says the customer.
"Okay," says the bartender, "If you say you paid, you did."
The guy then goes outside and tells a friend he sees that the bartender can't remember if his customers have paid.
The second man then goes in, orders a beer and later pulls the same scam.
The barkeep responds, "If you say you paid, I'll take your word for it."
Then that customer goes into the street, sees an old friend, and tells him how to get some free drinks.
The man rushes into the bar and begins to drink high-balls when, suddenly, the bartender leans over sand says, "You know, a funny thing happened in here today. Two guy’s were drinking beer, neither paid and both claimed that they did. The next guy who tries that is going to get punched in the nose."
"The nerve of some people," the final patron responds. "Just give me my change and I'll be on my way."