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