So three strings walk into a bar in Texas. Now there's a law in Texas that says strings can't drink, so this is a pretty rebellious thing. But the String #3 says to the others "C'mon, let's have some fun!"
So String #1 walks up to the bar. "Bartender," he says, "I'd like a beer."
"No can do," says the bartender. "You're a string. You want a soda or something?"
The string walks back to the table dejected.
String #2 steps up, but he's a little more crafty. He goes over to the coat rack, throws on a hat and a coat, and walks up to the bar, changing his voice to try to sound more like a person.
"Bartender," he says, "I'd like a beer."
"Sure thing, bud, comin right ... wait a minute! You're a string! Get outta here!"
Well the third string just laughs. He says "Guys, lemme show you how it's done." So he ties himself in a knot and teases out each end of himself. Then he walks up to the bar and confidently order a beer.
"You know I can't do that," says the bartender. "You're a string."
The string looks him squarely in the eyes and says "No sir, I'm a frayed knot."