Knock, knock.
Who's there?
Nacho.
Nacho who?
Nacho Cheese!
Knock, knock.
Who's there?
Nacho.
Nacho who?
Nacho Cheese!
Listen up, chucklehead! This joke is a classic "dad joke" because it relies on a pun, which is a play on words. "Nacho" sounds like "Not yo" so when you say "Nacho Cheese" it sounds like "Not yo cheese!" which is kinda stupid and that's why people laugh. You probably don't get it because you're not smart.