The knot

A string walks into a bar and asks the waiter for a beer.


The waiter says, "I am sorry but we can't serve strings here."


The string goes home, ties him in a knot, and messes up his hair. He goes back
to the bar about an hour later, sits down and says, "Waiter, give me a beer."


The waiter says,"Hey aren't you the string who came in here earlier."


The knot replies, "No, I'm a fraud knot."