A Texan walks into an Irish pub and clears his voice to the crowd of drinkers. He says, "I hear you all are a bunch of hard drinkers. I'll bet any one of you $500 American dollars that you can't drink 10 pints of Guinness back-to-back."
The room is quiet and no one takes up the offer. One man even leaves.
Ten minutes later the same gentleman who left shows back up and taps the man on the shoulder. "Is your bet still good?" the Irishman asks. "Yup!" the Texan says, and asks the bartender to line up 10 pints of Guinness. Immediately the Irishman tears into all 10 of the pint glasses, drinking them all back-to-back.
The other pub patrons cheer as the man Texan sits in amazement. He gives the Irishman the $500 and says, "If ya don't mind me askin', where did you go for that ten minutes you were gone?" The Irishman replies, "Oh..... I went to the pub down the street to see if I could do it first..."