Because she didn't have any arms. Knock Knock..who's there..Not Sara.
She had no arms. BONUS JOKE: Knock Knock. Who's there Not Sally.
Because it cracked itself up.
Because she had no arms. Knock Knock Who's there? Not Sally :)
Someone threw a fridge at her. It's not supposed to make sense
No, cows go moo.
2.Knock Knock 1.She didn't have any arms!! 2. Who's there NOT SARA!!