|A string goes into a bar, slides onto the bar stool and asks the bartender to give him a beer.
“I don’t serve strings,” the bartender says.
The string goes home, ties himself in a knot, and frays the top of himself. He then returns to the bar and again asks the bartender to give him a beer.
“Hey, aren’t you the string that was just here?” asks the bartender.
The string replies, “No… I’m a frayed knot.”