A piece of string walks into a bar and orders a beer. The bartender takes one look at the piece of string and says, 'We don't serve pieces of string here!' With that, the piece of string walks outside, ties itself up in a knot and frayes its ends. The piece of string then walks back into the bar and orders a beer. The bartender takes a long look at the piece of string and then asks, 'Aren't you the same piece of string that walked in here a while ago?' The string proudly says, 'NO. I'm a frayed knot.