Because she had no arms. "knock knock" "whose there?" "not sally!"
Bob
There are more birds on that side.
He falls off
Because freedom rings.
Swim down and knock on the hatch. (In Sweden we have a running tradition of telling jokes about stupid norwegians. They do the same about swedes)
She had no arms. BONUS JOKE: Knock Knock. Who's there Not Sally.
He had no arms. Sorry that joke was stupid, let me try again. Knock Knock "Whose there?" Not Billy