The string sits down at the bar and starts to order a drink.
The bartender interrupts him and says “Sorry, sir, but we don’t serve strings here.”
The string gets upset and goes out into the back alley, where he ties himself in a knot and cuts himself up over the situation.
After calming down, he heads back in to the bar and sits down once more.
The bartender comes over again and asks “Hey, aren’t you that same string that was in here before?”
The string replies “No, I’m a frayed knot.”