Didn't have any hands.. (the real punch line) Knock knock.. Who's there Not Timmy..
Because he fell asleep on duty.
It was dead.
Raise my hand. - Taken from local Chinese joint fortune cookie.
Look! No hands!
Because she had no arms. Knock, knock! (Who's there) Well, it ain't Mary.
Cause she's got no arms. Knock Knock. Who's there? Not Sally.
A race condition. Who is there?
Because she didn't have any arms. Knock knock. (Who's there?)...not Sarah.
He didn't
Because Bill threw a mattress at him.