A piece of rope walks into a bar.
The bartender yells, "Hey, get out of here -- we don't serve ropes in here!"
Rope comes back later, same thing, he's told to leave. no ropes allowed.
He goes outside, ties himself in a knot, waits a few minutes, and goes back in.
The bartender asks, "Hey, aren't you that rope from earlier?"
"No I'm knot."