Here is a philosophical joke I thought of the other day…
A Guy Walks Into A Bar.
Does he exist?
How about this…
Non-existent thing walks into a bar.
If you answer that a) the guy in the first joke doesn’t exist, and you agree that b) non-existing things can’t walk into a bar, it follows that c) a joke that starts with “A Guy Walks Into A Bar” is incomprehensible.
From there we can conclude that a person that is laughing at any “A Guy Walks Into A Bar” joke, is clearly faking it, as per c) he couldn’t possibly understand it.