Since I was a child, I was intrigued by two similar apparent inside jokes that I never understood:
in an episode of "The Simpsons" when Ned Flanders runs amok, he shoots various people from a church tower. The only one to fight back is a postman that is surprisingly armed.
in the dream sequence of the third movie in the "The Naked Gun" trilogy, Frank is attacked by a group of heavily armed postmen.
I would consider armed postmen an absurdity, but why postmen in two completely unrelated jokes? Was there some public debate about armed postmen at some point? Are they even armed under some circumstances?