Because he doesn't have arms. Knock knock. Who's there? Not Joey.
Thalidomide
Bob
She had no arms
Bi-polar
She had no arms! Why didnt jillian get back up? She had no legs! Knock knock! Whos there? Sure as hell not jillian :)
Jeffrey. Knock knock, Who's there? NOT JEFFREY
It doesn't make sense, he and all his friends are always stuck in second gear