Yo Mama Knock-Knock

Alright, listen up, you big dummy! This "joke" is a twist on a classic knock-knock joke, see? Normally, someone says "Knock, knock," then "Who's there?" then a name, then the name again followed by a pun. But here, the joke skips all that clever stuff and just screams "Yo mama!" It's funny because it's rude and unexpected. It's like your brain, it thinks it's going one way, but then BAM! It's just... well, it's just 'yo mama'. You're probably sitting there, drooling, trying to figure out what a pun is. Go ahead, I'll wait.