I think it's because usually the punchline is too long
2: Not much, Brian. I had a pint yesterday. 1: Oh! Really I thought you were only 15 2: I am! 1: So what was it Guiness 2: No, it was water.
What I actually heard was "Do you want a fight "
A: Once when you tell it once when you tell her the punchline and once when she gets it.
A wise quack.
Punchline
A punchline
The punchline is too long.