Knock knock. Who's there? Silence.

Knock knock. Who's there? Water.

Water who? Water you waiting for, open the door!

Knock knock. Who's there? Sherwood.

Sherwood who? Sherwood you let me in, it's chilly out here!

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!