Mommy was reading a book to Michael when he interrupted, "There are two kinds of 'not'."

"Oh really? What are the two kinds of 'not'?"

"There's the 'not' that means, 'no'....and then there's the kind of knot that's a circle," he did his best to show what it looks like with his hand, "you tie with a string and it's a circle like this. See...? Knot."