He walks in and he sits down next to a man with leprosy, who also had his share of bad luck. The young man says to the bartender, "Gimme a beer," so, he gets one. He drinks it fast, and runs and throws up.
The guy with leprosy says, "If I make you that uncomfortable, well, I will leave , OK?" The other guy says, "No, you ain't making me sick, it's the guy behind you. He's dipping his nachos into your back!"