A man walks into a bar and sits next to another guy. The second guy says, "See that building over there? If you jump off the building you will land safely on the ground." The first guy says, "Bullshit. Impossible!"
The second guy says, "Come on, I’ll show you." So they go to the building and take the elevator to the top of the roof.
The second guy says, "Go ahead."
The first guy says, "You go first. I wanna make sure it works before I do anything stupid." So the second guy jumps off and lands safely on the ground.
Then the first guy jumps and he splats on the ground.
The second guy walks back into the bar, laughing. The bartender says, "You know, Superman, you can be a real asshole when you’re drunk."