A string walks into a bar and ask the waiter for a beer.
The waiter says, I am sorry but we can't serve strings1 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 knot replies, No, I'm a fraid knot.
The waiter says, I am sorry but we can't serve strings1 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 knot replies, No, I'm a fraid knot.