Someone who pointlessly knocks on the door.
He wanted to win the No Bell Prize.
A waist of time *door closes on way out*
Because freedom rings.
She had no arms. Knock knock Who's there? Obviously not Sally
Gingerbread. Edit: This is more of an out-loud joke. So, maybe it'll help if it read: "Ginger-bred" instead.
A Doberman puncher!
A Jehovah's Witness.
Someone who knocks on your door for no apparent reason.
An atheist. He doesn't really believe in himself.
Someone knocking at your door for no apparent reason.