Four kite strings in a bar

Four kite strings stop in front of a shady looking bar.
The first kite string say: "I'm going in for a beer." He goes in and the bartender says: "Hey, we don't serve kite strings in here." So he walks out.
The second and third kite strings go in with the same results... Get out, we don't serve kite strings in here!
The fourth kite string takes off his hat and places his hand on top his head rubbing his hair around and tangling it. He places his hat back onto his head and boldly goes into the bar. The bartender looks at him kind of questioning, and says: "Hey, aren't you a kite string!?!"
The kite string takes off his hat and bows, saying, "No, I'm a frayed knot."