Knock knock. Who's there? Lettuce.

Lettuce who? Lettuce in, and we'll 'romaine' here all night, serving up 'head'-spinning puns until you 'leaf' feeling 'crisp' with laughter!

Knock knock. Who's there? Flour.

Flour who? I knead to talk to you.

Knock knock. Who's there? Peas.

Peas who? Peas-fully waiting for you to open the door!

Knock knock. Who's there? Marmalade.

Marmalade who? Ma'am, I'd like to spread some cheer with a joke that's jam-packed with puns!