A piece of string walks into a bar and orders a drink. The bartender looks at him and says, "we don't serve alcohol to strings". So, the piece of string walks out dejectedly. The next day, the piece of string gets an idea for a disguise .... he ties his head in a knot and ruffles out the edges so it's kind of fluffy and heads back to the bar, walks up and orders a drink. The bartender looks at him, and says "Hey, aren't you that same piece of string who tried to order a drink yesterday?" The piece of string replies "No, I'm afraid not". (I'm a frayed knot).