Here's your hilarious joke:

An Englishman, an Irishman and an American Get drunk in a bar on the top floor of a skyscraper. The American says: "There's an updraft on the 7th floor that allows you to jump out this window and land on the 4th floor." "Bullshit" says the Irish. So the American jumps from the top floor and sure enough; just as he goes past the 7th floor, he slows down and lands on the 4th. "Fucking fun!" says the Irish guy as he jumps. And falls to his death. "You're a right cunt when your drunk Superman!" says the Englishman

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