A beatnik walks into a diner:I read it in a Zippy the Pinhead comic the better part of two decades ago, and I think it took me about a day and a half before I finally got it (until that moment I wasn't actually sure there was anything to get - I just assumed it was some sort of Dada, surrealist koan). Only because I had just gone through my Jack Kerouac stage did I ever get it at all.
Beatnik: Hey, lady, can I have a slice of apple pie?
Waitress: The apple pie is gone.
Beatnik: Dig it! Give me two slices!
I'm curious. Do you get it? Don't worry if you don't. The explanation will be revealed at some appropriately groovy and un-premeditated moment.