Sarah's Lack of Arms

Alright listen up, genius. Sarah fell off the swing 'cause she ain't got no arms. Get it? And when they say "Knock, knock," and you ask "Who's there?" the answer is "Not Sarah" 'cause, well, she can't knock, 'cause, uh, she has no arms. Also, swings are dangerous, I saw you fall off one once. You have bad balance, and your parents enable you.