A man walks into a bar and says,
"Excuse me, I'd like a pint of beer." The bartender serves the drink and
says, "That'll be four dollars." The customer pulls out a twenty-dollar
bill and hands it to the bartender.

"Sorry, sir," the bartender
says, "but I can't accept that." The man pulls out a ten-dollar bill and the
bartender rejects his money again. "What's going on here?" the man asks.

Pointing to a neon sign, the bartender
explains, "This is a Singles Bar."