Knock knock. Who's there? Nobody.

Nobody who? Exactly. Why are you talking to the door?

Knock knock. Who's there? Blink.

Blink who? Blink and you'll miss this utterly tear-able pun about eye-popping humor, so prepare your ocular orb for an optic shock!

Knock knock. Who's there? Olive.

Olive who? Olive your jokes are so funny!

Knock knock. Who's there? Accordion.

Accordion who? Accordion to the weather report, it's going to rain!