String Walks into a Bar

A string walks into a bar.

The bartender says, "Can't you read? There's a sign on the door that says 'We don't serve strings!' Get out, we don't serve your kind here! Never come back!" The string leaves, dejected, and sits outside trying to decide what to do. A flash of brilliance comes upon him, and he ties himself into a bow and unravels his ends a little bit. He returns to the bar, and the bartender says, "You again? I thought I told you I didn't want to see you again!" The string replies, "But sir! I'm not a string!" The bartender looks confused and says, "You're not?" And the string says, "No, I'm a frayed knot."