The best knock knock joke is to ask someone to say, 'Knock Knock', if they comply, you ask, 'Who's there?' generally people don't really know what to follow up with. This is only funny if you're a bit of a dickhead. I do find it amusing.

— Nitrohairman, reddit.com

Knock knock. Who's there? A pile up? A pile up who? Read that one in a porta potty at a music festival this summer.

— Reddit, reddit.com

Knock knock Who's there? Billy. Billy who? Billy began to cry as he realized his own grandmother could no longer recognize the sound of his voice.

— Cheddartot, reddit.com

Knock Knock Who's there? Mike Snifferpippets. Mike Snifferpippets who? Oh come on, how many Mike Snifferpippets do you know? Now let me in, it's cold out here.

— mulletmusketeer, reddit.com

Knock, knock. Who's there? Grandpa. Grandpa who? Let me out of this casket!

— DVNO911, reddit.com

Knock knock. Who's there? I eat mop. I eat mop who? Gross...

— Swiveldick, reddit.com

Knock knock. Who's there? You know. You-Know-Wh- AVADA KEDAVRA!

— disisacrunksn, reddit.com

Knock-Knock. Who's there? To. To who? To whom.

— Vallessir, reddit.com

Knock knock. Who's there? Oink oink. Oink oink who? Are you a pig or an owl?

— Harasoluka, reddit.com

Knock knock. Who's there? Interrupting sloth. Interrupting sloth who? 15 seconds later... SLOOOTTTHHHHH

— jessicathecat168, reddit.com

Knock knock. Who's there? Interrupting doctor. Interrupting doctor w- You have cancer.

— IonicPaul, reddit.com

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