A string walks into a bar

A string walks into a bar. He asks for a shot of tequilla. The bartender replys "Sorry we don't serve strings".

So the string leaves. The next day, the same string walks back into the bar. He asks for a shot of tequilla.

The bartender replys "Sorry we do not serve strings, please go away."

The following day the string stands outside the bar debating about whether to go in or not. He ties himself in a knot and frays the bottom of the string. He goes in and asks for a shot of tequilla.

The bartender replys "Hey aren't you that string that's been coming in here all the time."

The string replys "No I'm a freyed knot".