Findings:

• that old Philip Glass knock knock joke
• Celebrity knock knock jokes
• The World's Worst Knock Knock Jokes
• I knocked on the massive door, and came one step closer to knowing what I didn't know before.
• I got the feeling the Fairy Council was mad at me when the president knocked over her coffee to get a better grip on my neck
• Knock knock who's there oh it's you
• It's a Hard Knock Life for a Cosmic Horror Cultist
• Knock it off
• The world will knock you on your ass. Are you ready for that?
• opportunity only knocks once
• Getting the wind knocked out of you
• I call, but I never talk. I knock, but I never enter. I feel a bit insecure.
• A knock there was upon the door
• knock
• Knock On Wood
• School of Hard Knocks
• knock out
• Divinity School of Hard Knocks
• Knock down
• Knock off
• Knock over
• Front tooth knocked out!
• Knock yourself out
• Darth Everything meets Death who has just knocked on his front door
• Knock down ginger
• Ask, Seek, Knock
• Knock on the Door
• If an Agent Knocks - Federal Investigators and Your Rights
• Don't knock it if you haven't tried it
• Three Knock Down Rule
• knocked up
• gene knockout
• Waiting for the knock
• Don't knock the glock
• Technical knock out
• The knock
• knock kneed
• push or knock
• Opportunity Knocks
• I get knocked down, but I get up again
• The last man on Earth sat alone in a room. There was a knock on the door.
• All his front teeth knocked out, living a nightmare
• Postman's Knock
• Who Knocks?
• knock up
• Knock Yokoyama
• Knock Sensor
• engine knock
• The Vampire Always Knocks in Triplicate
• Indymedia sites knocked off the net by the FBI
• P Knock (user)
• Rot Knocks
• Who knocks within?
• The last knock?
• Running joke
• joke
• inside joke
• -um joke
• Why women wear makeup and perfume
• The funniest joke in the world
• Daleks and stairs
• Polish jokes
• That was a joke, son.
• Dead baby jokes
• Golf jokes
• private joke
• Just some more jokes from the Necronomicon
• Pythagoras' Joke
• violin jokes
• viola jokes
• saxophone jokes
• Fuck 'em if they can't take a joke
• Batman: The Killing Joke
• A joke about tax collectors
• the bad conductor joke
• It's a Joke, Joyce
• Frog experiment joke
• Leprechaun Joke
• A Short Guide to Comparative Religions
• Gentile jokes
• Sexist jokes
• The "No soap, radio!" joke
• The Infamous Juan Joke
• The Most Disappointing Joke Ever
• Gorilla Joke
• A Cold War Joke
• Pirate jokes
• SI prefix jokes
• Fax machine practical joke
• A sexist joke I'm allowed to tell, due to being a woman
• Good practical jokes
• Declan the Humble Crab
• limbless torso jokes
• Dorm practical jokes
• The Big Joke Game
• That Joke Isn't Funny Anymore
• joke carbon dating server
• CowboyNeal joke
• When Running Jokes Go Bad
• dirty joke
• presidential elections are a joke
• bad Zentraedi name joke
• Navy Newbie Jokes
• impractical jokes
• diversity training is a joke
• The Full English Breakfast joke
• car joke
• Unfinished joke
• The sandwich joke
• American joke
• Drummer Jokes
• Henry Ford vs God
• I Started a Joke
• practical joke
• piano jokes
• The peg-legged pig
• physics jokes
• Monk jokes
• Irish jokes
• Jokes that will send you to hell
• Joke: Rivals from Japan and Germany
• Dad's "Joke"
• Essential dirty jokes
• Empire State Building Joke
• a medieval Welsh joke
• The Traveling Salesman joke
• The Joke
• Heaven joke
• Shortest mathematical joke
• Making jokes about The Pope
• The Drunk Joke
• Doctor jokes
• Mother-In-Law Jokes
• The Priest Joke
• A very mean bar trick
• Psychology/Biology of a joke
• Divide-by-zero joke
• Zombie baby jokes
• A joke about dealing with people
• Sardarji Jokes
• Punk jokes
• Truly Tasteless Jokes
• Elephant jokes
• Czechoslovakian jokes
• Bad jokes and the nature of racism
• Jokes and their Relation to the Unconscious
• Engineering jokes
• The Wikipedia Joke
• The Zebra Joke
• life is a joke (user)
• World's oldest joke
• Dave Award for the Funniest Joke of the Fringe
• The Old Texas Joke
• This is not a joke. It won't be easy. We will rule the world.
• joke (user)
• 100 Dollar Joke
• Dave Award for the Funniest Joke of the Fringe 2009
• The Cosmic Joke
• Knock knock joke
• Jokes (category)
• Dirty Jokes (category)
• Life's Little Jokes
• Cockneys And Their Jokes
• Dogs Don't Tell Jokes
• Killing Joke
• Weesper jokes
• Episcopalian jokes
• The old joke about the shopkeeper in the desert
• HMS Black Joke
• Menstruation jokes are NOT funny. Period.
• multilingual jokes
• poop and dick jokes are an important diagnostic tool
• dad joke

If you Log in you could create a "knock knock jokes" node. If you don't already have an account, you can register here.