Texan in Irish pub

A Texan walks into a pub in Ireland and says, "I'll give $500 to anybody in here who can drink 10 pints of Guinness in a row." No one takes him up on his offer; one man even leaves. Thirty minutes later, the guyswho'd left returns.
"Is your bet still good?" He asks. The Texan says yes, the bartender lines up 10 pints and the irishman drinks them all.
The Texan pays up and says, "If ya don't mind me askin', where did you go for that 30 minutes you were gone?"
The Irishman replies, "Oh, i went to the pub down the street to see if I could do it first."