A piece of string walks into a tavern and sits down at the bar.
The bartender says, "Sorry mate, we don't serve pieces of string in here, get lost."
Upset, the piece of string walks out the door. A sudden thought strikes him. He ties himself in a knot and messes his hair up.
He walks back into the tavern and approaches the bar. The bartender says, "Aren't you that piece of string from before...?"
"No," says the piece of string, "I'm a frayed knot."