No Outside Food Allowed

Two guys walk into a bar and sit down to eat their lunches. Then the bartender says, ''Sorry, but you can't eat your own food in here.'' So the two guys look at each other and swap lunches.

Bishop Brews

A bishop walks straight into a bar and orders a beer.
"You can't do that," the bartender says. "You can only move diagonally."

Dickens And The Martini

Charles Dickens walks into a bar and orders a martini. The bartender asks, “Olive or twist?”