A piece of string walks into a bar and orders a drink. The bartender looks at him and says, "We don't serve string here." So the string goes outside, twists himself up a bit, kind of roughs up his ends and walks back into the bar and orders a drink. The bartender looks at him and says, "Aren't you that little piece of string that was in here a few minutes ago?"
The string says, "No sir, I'm a frayed knot."