He says "I'll bet $1000 that no Irish man in here can drink 10 Guinness pints in under two minutes!" The Irish men at the bar pay him no attention. The American gets louder and louder, daring any Irish man to accept his challenge. One Irish man at the end of the bar, looking fed up with the loud American, leaves.
Five minutes later, the Irish man returns. The American is still offering his bet. The Irish man says to him, "I'll accept your challenge. Line them up."
The bartender pounds ten pints of Guinness and lines them up in a row. Everyone is watching. The Irish man says "start the clock!". The clock starts, and he downs each Guinness in order, one by one, until they're all gone in under two minutes.
The American is amazed. He says "That was the most incredible thing I've ever seen! But one question - where did you go for five minutes before coming back in and accepting my bet?"
The Irish man replied "Well, I went to go to the pub next door to make sure I could do it first!"
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