K-Chunk!: Kane Abelmann, a custodian in a nuclear missile silo, punches in his time card as he reports for work. (Storm Warnings (1986))

K-Pow!:
See Bang! Bang! Pow! K-Pow! Crash! Bash!
See Pow Pow K-Pow

Ka-Blam!: The sound of a Wild Pointy Hat Guy emerging suddenly, like a rocket, out of the ground. (Bezango (1994))

Ka-Boing!: Accompanied by musical notes. Roy suddenly (KA-BOING!) has foot-long planks protrude from his eye sockets, with both eyeballs balancing precariously on the ends of both planks. The eyeballs, which have little legs and arms, lift off the top of their "craniums," allowing crazy little "spy-flies" to emerge from within them and go out into the world. (Pacemaker Defect (1982))

Ka-Pow!: A man with an enormous floating cranium rises so high in the atmosphere that his head pops, creating this sound. (Big Picture Picture Book (1983))

Ka-rash!: See Whoosh! Crash! Zow! Bonk! Bonk! Smash! Zip! Zow! Zip! Skrash! Rrrrr-rrrr-sput-rrrr-sput Blink! Ka-rash!

Ka-Sklorp!: A small space satellite hits Mukey the Mutant Membrane on the head, awakening him from a dream while he sleeps in a bed floating above the Earth. (Cranium Frenzy 6 (1990))

Kachook Kachook Kachook: The Air Pump Angel, basically a bicycle pump with a halo and wings, fills a Morty Dog with (too much) air. (Cranium Frenzy 5 (1985))

Kawhump!: The sound of a meteorite hitting an innocent bystander. Originally it was thrown by the Big G at a Morty Dog, but the mutt bent over to pick up a dime at a key moment. Meanwhile, the bystander now has a giant hole where his torso used to be, yet he can still walk around, and soon becomes "holier-than-thou." (Cartoon Loonacy 9 (1986))

Kawhump! Kawhump! Kawhump! Kawhump! Kawhump!: The Big G, who is apparently a bad aim, throws the contents of an entire carton of meteors, and all of them hit innocent bystanders, and all the bystanders become "holier-than-thou," creating a new cult with a Morty Dog as the object of worship. (Cartoon Loonacy 9 (1986))

Ker-Plop!: A Morty Dog and Arnie Wormwood land back on the hard floor of their jail cell via the tube at the end of the rainbow. (Starhead Presents 1 (1986))

Ker-wham!: Super Jobbo throws a grenade into the hold of an enemy ship, blowing it up. (Mythic Residue (1978))

Kerploosh!!! Chomp! Grrrrp!!! Rrrrrrrrrrrrrrrrrip!!! Pop! Sproing!! Zow! Splat! Bonk! Bonk! Bonk!: A Morty Dog is on a tiny island with a single palm tree. A shark jumps out of the water (Kerploosh!!!), gets a grip on Morty's tail with his teeth (Chomp!), begins to pull the mutt into the water. Grabbing the top of the tree, which bends violently as the shark pulls (Grrrrp!!!), Morty's spine rips out (Rrrrrrrrrrrrrrrrrip!!! Pop!) making the now floppy dog, along with three coconuts, fly far into the air as the tree acts as a catapult (Sproing!! Zow!). Morty makes a hard bellyflop on the mainland (Splat!) and the three coconuts land on his head (Bonk! Bonk! Bonk!) (Cranium Frenzy 5 (1985))

Kick!:
See Skritch Scratch, Skritch Scratch Honk! Skritch Scratch Clunk! Yap Yap Yap Yap Kick! Glug Gabug Glug Gabug
See Zip! Kick! Creak!

Kick! Whump!: A giant figure appears professing to be God, but once it is kicked over and lands with a Whump, it turns out to be a "big sheet of cardboard, with some wimp running a mike behind it!" (End of the Earth and Turn Left (1985))

Knock! Knock!:
(1) The sound of two big sharks, posing as investors and wearing suits and sunglasses, knocking on the door of the home of guys who have frogs stuck in the top of their craniums. (Bezango (1994))
(2) Mark Sense knocks at the door of Otto, in vain. Otto won't come to the door because his head is growing at an incredible rate. At this point in the story, his cranium comprises half his body size. (Cranium Frenzy 2 (1982))
(3) An evil version of Mr. Zip knocks on Orville's door and delivers a letter:
Evil version of Mr. Zip: Learn to swim, you wad of phlegm.
Caption box with arrow to letter in evil version of Mr. Zip's hand: Device of plot from little snot.
Orville: Cut the chetter and hand me the letter.
(Storm Warnings (1986))

Knock Knock Knock Knock:
(1) A Morty Dog knocks on the door of his cartoon creator, who is watching an episode of "Leave It To Beaver." (Big Mouth 3 (1993))
(2) A homeless man knocks on the door of a church at 6 a.m. A minister on the verge of a nervous breakdown hides under the covers of his bed, attempting to ignore the sound. (Big Picture Picture Book (1983))

Konk!: The sound of an empty bottle of Bozo Beer as it bounces off the head of Mark Sense, who is attempting to stop a frightened mob from killing Otto, the man with a cranium as big as a house. (Cranium Frenzy 2 (1982))

Krak!: A Morty Dog sits in his room at the Squalid Motel, peacefully reading a book entitled Death Despair and Ruin, when the door is suddenly kicked to pieces (KRAK!) by two fedora wearing thugs. They approach Morty and ask, "Millard Fillmore, or, Chester Alan Arthur?" while holding a picture of each. "What?" asks Morty. "Don't play dumb with us, fleabag!" one growls, "Just choose!" (How Two Ex-Presidents Went Up My Nose! (1994))

Krr Flush! Gurgle Gurgle Gurgle Floshoomm: Ed flushes a toilet. (Random Reflections (1976))