Levitating Beer

These two strangers are having a drink at a bar. The one orders a beer and drinks it down rightaway and then sighs with pleasure. He immedietly walks over to the window jumps out and floats to the ground. A minute later he walks back in and sits down next to the stranger. The stranger can't believe what he just saw and asks for an explanation. The other man explains that when ever he drinks this certain kind of beer it makes him feel so good he feels like floating. The stranger has heard enough and orders the same beer and drinks it right down goes over to the window and jumps out, splatt!!! The bartender looks over at the guy left at the bar and says, "Superman sometimes you're such an ass".