Sure, in 'Iron Apple', the Mandarin (Orange) is played for laughs. However, it's kind of jarring to see Orange go at Iron Apple whilst snarling in absolute rage and fury, with a clear intent to kill. His main weapon of choice is also a hate-induced version of his laugh.
Spike's death in Tough Enough is downrightbrutal in how drawn-out it is. After half a minute of No Selling Knife and a set of nutcrackers, He Who Must Not Be Seen resorts to using an frickin' hatchet and pickaxe to basically bore a hole in Spike's head, which is followed by him physically working his fingers into Spike's wound and slowly ripping him completely in half. All of this is underscored by Spike slowly changing from confident bravado to screaming in agony as he's slowly cracked open.
Greg the Tomato from SKYDIVING! could probably give Spike a run for his money in the most terrifying death department. After tossing a chainsaw away while in mid air, Greg pays the price for the most gruesome example of a Brick Joke: said chainsaw comes down and outright impales Greg with enough force to pop out his eyeballs! Greg's still screaming corpse being dragged along by the chainsaw and the foods screaming in horror add to the effect. Yes, even Orange of all people was horrified at that death.
Muddy Buddy’s death could outweigh both Spike and Greg as he’s slowly peeled to death, starting with his face. His scream and Orange being his usual self don’t help at all.
The Haunted Leaf Pile is the stuff nightmares are made of. Warning: it's not the fact somebody dies as per usual.
Have you ever wanted to experience being killed by Knife in FIRST PERSON?
Normally, it's intended to be funny, but sometimes seeing Orange's victims getting so annoyed and angry is genuinely terrifying.
Pretty much anytime the screams sound too realistic to be funny.
At one point in "World's Longest Wazzup!" Pear mentions the trope when he sees Orange's redesign of the American flag.
Jump Scare! and its sequel are definitive examples. We recieve a Jump Scare from Orange, Pear, Marshmallow, and in the sequel, Grapefruit and an unnamed egg. Not only that, but the fact that their skulls jump off their skins when getting scared its absolutely terrifying.
The big sundae from the Massive Ice Cream Sundae Challenge probably qualifies as a definitive Knight of Cerebus for the series. For starters, he eats many people (one of them being a child) just to make himself more powerful, which is considered cannibalism. Even Orange and Little Apple are appalled by his evil acts.
"Knife Of The Living Dead" shows that Orange is capable of annoying the dead; giving way to quite the Gorn fueled zombie designs. For example, Strawberry from Kitchen Carnage is missing an eye and has a knife stuck to his head, Tomato has a blender blade stuck on him, and Durian probably has the most revolting appearance of all: He's still split in half, and still has the pickaxe dug into him.
While it's still a normal AO episode for the most of it, "Directed by Michael Baygel" has the titular bagel cue several explosions, culminating in cuing the Casteroid. More specifically, a world-threatening bottle of Castor Oil that will destroy Earth if it collides with it, just for the sake of awesome explosions. Thankfully, it's thwarted by a literal Plot Hole, since it is a Michael Baygel production.
"It's A Wonderful Knife" has probably the most fucked concept of twisting a classic phrase on it's end: "everytime a bell rings, an angel clips it's wings". And that means, Angel Foodcakes are randomly stabbed to death with knives anytime a bell is rung. it can be part Crosses the Line Twice, but the fear factor still stays.
Did we mention anyone in Creepy Pasta's stories, no matter what role they play, will die if their character is dead too? It's very much implied Grapefruit wasn't so lucky in this story.
The intro for Shocktober 2020 looks like it came straight out of a Sequel Hook from a horror film. It starts off with Orange bursting out of a grave as a zombie, which seems simple enough...but then he suddenly dissolves into slime on the spot, and things only go downhill from here. Slime!Orange starts to crawl forward as Slime!Pear and Slime!Grapefruit (sporting their appearances in the Shocktober 2018 intro) do the same before the suddenly crash into each other, which results in them fusing into a slimy monster. It's also implied that Orange, Pear, and Grapefruit aren't the same fruits they were before, because now they're a fused being who is out for blood, judging by how that monster lunges right at you with a snap.
The Grimace Shake is just as warped as ever, although it is weighed out by some of it's ways of death being hilariously executed. However, when Grapefruit decides to mix it with a protein shake, the results aren't so pretty, to put it lightly.
Marshmallow seems like the last character to be on this page right? Nope as when they are angry, things go bad for the instigator. Though the real scare is that we don’t see what exactly happens to the soul who upsets Marshmallow though we always see the aftermath of Marshmallow’s rage. The most we've seen of Marshmallow brutalizing someone on-screen is a Funny Background Event in Buddy Cops.