englishman,irishman and american

englishman,irishman and american all stood at the top of a skyscraper when the american turns to the irishman and says "do you know that because of the hight if this building and the upward pressure of the wind you can jump off and as you hurtle to the ground the wind will blow you straight back up again" the irishman goes "bullshit so the american says "ill show you" and jumps straight off goes flying towards the ground then starts slowing down then as he gets about 20 yards from th floor stops floats for about a second then goes straight back up to the roof landng gently on the edge. the irishman says"fuck me iv got to try that" so he jumps of and goes flying down and smashes straight into the floor the englishman turns to the american and says "you cant half be a bastard sometimes superman"