A string walks into a bar and ask the waiter for a beer.
The waiter says, “I am sorry but we can’t serve strings here.
“The string goes home, ties himself 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 string replies, “No, I’m a fraid knot.”