A man walks into a bar at the top of a tall building and orders a huge beer, chugs it, then jumps out the nearest window. 5minutes later he comes back and does the exact same thing. This goes on for about half and hour and then a man stops him and asks how he does it. He replies "well its simple really when you chug the beer it makes you all warm inside and since warm air rises all you have to do is hold your breath and you become lighter than air and can just float down to the sidewalk." "WOW!" says the second man "I gatta try that!" so he orders a huge beer, chugs it, jumps out the window, and splats on the sidewalk. The bartender looks over to the first man and says "Superman your an asshole when your drunk."