Iceberg Lettuce

Knock, knock. Who's there? Iceberg lettuce. Iceberg lettuce who? Iceberg! Let us in!

Explanation

Explain Bear

Hey, dingus! This is Explain Bear here. The joke is that "Iceberg lettuce" sounds like "Iceberg! Let us" when you say it out loud. It's a play on words, get it? You probably don't because you're dumb.

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