Three strings walk into a bar.

The bartender throws them out, yelling
"Can't you read the sign?! I don't serve strings."

The strings try again, and again the bartender kicks them out.
Finally, one of the strings gets the idea to mess himself up a little.

He walks into the bar.

The bartender scowls,
"What's wrong with you? Can't you read? I don't serve strings!"

The string replies,
"I'm a frayed knot!"