A piece of string walks into a bar, walks up to the barkeep, and orders a beer.
“Sorry, buddy, we don’t serve your kind here,” says the barkeep, pointing him back out the door.
The piece of string waits a couple days, then enters the same bar, walks up to the barkeep, and again orders a beer.
“Come on, do you think I’m stupid? I told you we don’t serve your kind here,” he tells the piece of string.
Frustrated, but determined, the piece of string attempts to disguise himself. The very next day, he unravels his one end a bit and ties himself in the middle. He proceeds to go into the same bar again, walks up to the barkeep, and orders yet another beer.
“Hey, aren’t you the same piece of string I told to get out of here the past couple days?!?” shouts the barkeep.
The string replies, “No, I’m a frayed knot.”