Building Updrafts

There was a tourist sitting in a New York bar having a drink, when another guy walks over to him and asks, "Have you heard of the New York updrafts?" The tourist responds, "No". The guy says, "Well, finish your beer and meet me on top of that building in a half-an-hour." Thirty minutes later they both meet on top of the building. The guy says to the tourist, "Watch this!", and he jumps off the building and floats back onto the ledge. The tourist says, "Do it again!!". So the guy jumps off and floats back onto the ledge. The tourist says, "If you do it one more time I'll do it." So the guy jumps off for a third time and floats back onto the ledge. The tourist then jumps off the building and hits the pavement. Two guys walk by the building, look up and say, "Damn Superman, you're an asshole when you're drunk."