Orphan Knock-Knock

Alright listen up, chucklehead. This joke is funny because it's a knock-knock joke, but instead of a name, it's sayin' the person don't got parents, making it a dark joke. Get it? I am sure you do not. Listen, the joke implies the person is an orphan. An orphan is a child who has lost both parents through death or abandonment. You look like you were abandoned.