A rope walks into a bar...
goes up to the bartender, and says' "can I order a drink".
The bartender says "No, we don't serve ropes here".
So the rope leaves the bar, and while he's outside he gets angry about the prejudice. He works himself up over it, and twists and turns and pulls at his ends and tugs at his hair. Then he storms back into the bar.
"Barkeep, I want a drink".
The barkeep looks him over and says "We don't serve rope here, are you a rope?"
To which of course the rope responded "I'm a frayed knot. Give me the drink."