Three men are sitting in a bar at the top of a cliff. The first man says: „One more beer, and I think I could fly.“ He drinks his beer, walks to the cliff’s edge and jumps. The man starts falling, but then flies back to the top of the cliff. The second man says, „If I had another beer, I’m sure I could fly, too.“
The second man drinks, jumps off the cliff and falls to the bottom.
The third man turns to the first and says, “ You know, Superman, you’re a real jerk when you drink.“