Here's The Joke

A string walks into bar and asks for a rum and a cola. But the bartender says, "There is no strings allowed in here!"

So he goes into the bathroom and ties himself into a knot and frays himself at the ends.

Then he walks back out and asks for a rum and a cola. The bartender asks, "Weren't you just the string that walked in here?"

"No," he says, "I'm a frayed knot!"