Because she didn't have any arms. Knock knock. (Who's there?)...not Sarah.
Baa-Dum-Sss
It was dead.
Cause she doesn't have arms. Knock, Knock, Whose there Not Sally...
Jimmy pushed her... Which is a shame because she was getting used to swinging without arms.
Cause she's got no arms. Knock Knock. Who's there? Not Sally.
Never mind. It's pointless.
Everywhere
Because she had no arms. Knock-knock! "Who's there " Not Sarah.