Some of the Friendships in II, which are all followed by Shao Kahn's bewildered "Friendship?!"
And MK3, he cries, "Friendship! Friendship? Again?!"
The Wastelands Stage in Armageddon has a stage fatality that launches flaming, screaming characters into a building by catapult, complete with a cartoony splat at the end and them sliding down while groaning in agony. The absolute winner has to be Scorpion (and Chameleon by extension) who screams like a total biatch; both videos of all characters expept Khameleon can be seen here and here, though be warned, you will be cracking up laughing by the time you've seen them both.
Cassie Cage's fatality in MKX: After kneecapping her opponent, she shoots them in the head, causing blood to stream out. She then plugs the hole with her gum, making a gum bubble that expands and pops.
In 2 and 3, when Noob Saibot won a round, the announcer didn't actually say his name. Instead, for 2, he would say, "Feel the power of" followed by a scream of "Toasty!" For 3, he would say, "It's official: you suck."
It doesn't end there: in Mortal Kombat Komplete, his fatality is described as thus:
Noob Saibot plays tug of war for keeps.
Johnny Cage's Groin Attack towards Goro, especially since upon impact, the camera cut right to Goro's eyes dilating as he moaned in pain.
Raiden then cheers and slaps another spectator on the back...then sheepishly apologizes. Made even funnier by the fact that the spectator is one of Shang Tsung's Mooks.
Even funnier is the mook's look of confusion when Raiden apologizes.
The twins mooks who seem to be a little HoYay for Goro.
"Those were $500 sunglasses, asshole!"
Even funnier when Johnny evades Goro he nurses his own hand in pain. Balls of Steel indeed.
Less so but still good, Cage leaves an autographed photo after defeating Scorpion as a nod to his Friendship from the games.
Johnny Cage meets Liu Kang for the first time. He tries to pay him to carry his luggage onboard the ship, thinking he's some valet. Liu Kang takes the money, grabs a suitcase, walks over to the edge of the water, drops it in, and walks off.
Johnny Cage:(watching his luggage sink) Huh. Thank God I didn't ask him to park the car.
The comic spectacle of Johnny Cage carrying more bags than he knows what to do with onto the island, first falling over onto the beach, then the "no more steps" line, then Johnny falling over atop a large staircase and Liu asking "Do you need help with those?"