Knock, knock.
Who's there?
Lettuce.
Lettuce who?
Lettuce out of school early!
Lettuce Out of School
Categories
Explanation
Experiment
Explain Bear
Listen here, this is a play on words. The joke sets you up with a question and then the answer sounds like "Let us out of school early!" which is what everyone wants. Also, fun fact: your brain is smaller than a walnut.