Three guys are in a bar on the top of a cliff. The first guy says to the other guys "You know, if had just one more beer, I think I could fly." The second guy says "No Way!" So the first guy orders a beer and drinks it. Then all three guys walk out to the edge of the cliff. The first guy jumps off, starts falling to the ground, and then flies back to the top of the cliff.
The second guy is totally amazed, so he says "You know, if I had another beer, I bet I could do that too." So all three guys go into the bar, and the second guy has another beer. After he finished, he said "Ok, I will be able to fly now" So they all went outside and the second guy jumped off of the cliff and feel to the bottom, where he hit the ground and died instantly. The third guy turned to the first guy and said "You know Superman, you are a real jerk when you drink."