Lettuce in jokes
Knock, knock.
Who's there?
Lettuce.
Lettuce who?
Lettuce in and I'll tell ya.
Knock, knock.
Who's there?
Lettuce in.
Lettuce in who?
Lettuce in, it's cold out here!
Knock, knock. Who's there? Iceberg lettuce. Iceberg lettuce who? Iceberg! Let us in!