A Frayed Knot

A piece of string walks into a bar.

The bartender says, "Hey, get out. We don't serve string here." So the string politely gets up and exits the bar. He walks down the street a little ways until he finds a bum. He tells the bum, "Hey. Pick me up. Tangle me a little. Yeah, just like that. Now run your finger up and down my edges... perfect!" Then the string goes back into the bar. The bartender immediately sees him and says, "Aren't you that same string I just kicked out?" The string says, "No, I'm a frayed knot."