Knock knock. Who's there? Donut.

Donut who? Donut even think about glazing over this punchline; it's sure to be sweet!

Knock knock. Who's there? Ice Cream.

Ice Cream who? Ice Cream so loud if you don't open the door, this joke will *cone*-fuse everyone, and I'll *melt* into a puddle of *sundae* regrets!

Knock knock. Who's there? Ken.

Ken who? Ken I come in already? It's cold out here!

Knock knock. Who's there? A philosophical question.

A philosophical question who? If a joke falls flat in the forest, and no one laughs, was it ever funny?