A length of rope walks into a bar, sits down and orders a beer. The
bartender says, "Hay, we don't serve ropes in here."

Disappointed, the rope leaves. Suddenly he gets an idea. He stops a
man on the street and asks, "Sir, will you please tie a knot in me and
then separate my strands at both ends?" "Sure," says the man,
shrugging, "why not."

The rope goes back into the bar, sits down and orders another beer.
The bartender looks him over and asks: "Say, aren't you the same rope
that was just here?"

"Nope," he replies, shaking his head, "frayed knot."