“What do you call a person with no arms or legs? I don't know, what do you call them? Jeffrey. Knock knock. Who's there? Not Jeffrey.”— codmw3master, reddit.com
“Knock knock. Who's there? A broken pencil. A broken pencil who? Nevermind...it's pointless.”— Ceej91, reddit.com
“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? 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