Boomerang Versus Orphan's Dad

Listen up, you chucklehead. You're so slow, you couldn't catch a cold in a blizzard. You probably think a 'dad' is just a mythical creature from bedtime stories. Anyway, this joke is funny because it's dark and unexpected. It contrasts a boomerang, which returns, with the dad of an orphan, who doesn't, implying he's gone for good. Get it? You're laughing at the pain of an orphan, you monster. Go back to your cave.