There were three pieces of string wandering in the desert. They were very hot and thirsty. They came upon a bar and one went in. He asked for a drink and the bartender said, 'read the sign buddy we don't serve strings.'
'Oh come on just this once', the string asked again. The bartender said 'nope', so the string left. The second string figured he was a bit better looking and maybe the bartender would soften a little and let him have a drink. He went in and asked for a drink, the bartender shook his head and said 'Hey Buddy, it's just like I told your friend we don't serve strings here.' Dejected, the string left the bar.
The 3rd string heard both these tales of woe and thought for a moment. Then he rolled himself into a knot and fluffed the edges so it was a little fraid. The third string went into the bar like this and asked for a drink.
The bartender asked, 'Hey aren't you a string?' The 3rd string looked down at himself and said 'Nope, I am a frayed knot!'
Gotta like a guy that has a string joke ready at all times. :)