A man walks into a bar and says,"Excuse me, I'd like a pint of beer."
The bartender serves the drink andsays, "That'll be four dollars."
The customer pulls out a twenty-dollarbill and hands it to the bartender.
"Sorry, sir," the bartendersays, "but I can't accept that."
The man pulls out a ten-dollar bill and thebartender rejects his money again. "What's going on here?" the man asks.
Pointing to a neon sign, the bartenderexplains, "This is a Singles Bar."