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Doubly so since he does that expression a few times. Stick out spines and poke tongue out. It's almost adorable.
While we're at it, almost every single facial expression in the game.
There's also Knuckles' absolutely apathetic cry of "Oh no." whenever he is hit in the boss battle against him.
Same goes for Sonic whenever you fight against him.
The way Sonic says "No." when he dies is just as bad.
It's even "better" if he falls into water or a bottomless pit. "NAUGH."
Sonic half-yelling "Eeeeeeeeegmaaaaaaan" with all the passion and rage of a waitress reciting the beer menu.
Well, he was about to fall unconscious... Still Narm, though, because "Eggman" is just a funny thing to yell no matter what.
Tails' version of it is arguably even funnier. He sounds like a zombie.
Once Chaos gets the first Emerald, Sonic tells Tails "We can't let that monster get any bigger. It could get ugly!" It sounds more like he's worried about how hideous Chaos will look, rather than the danger he poses.
This arguably becomes an unintentional Brick Joke once you see Perfect Chaos's in-game model, which resembles Godzilla's retarded ameboid cousin.
Speaking of, it was meant to be an homage to Biollante. The concept art looks amazing. The actual result, though... well, Sonic Generations at least corrected it.
"All's well that ends well, right?" Made even funnier if you've seen the Hell Fire Comms play-through of it:
Fastest Thing Alive:THE CITY'S BEEN FUCKING DESTROYED!!!!
Not to mention the "Ha ha ha, see if you can make it through here, Sonic!" line whenever he reveals his weak-point for all to see...
Some of the lyrics to Knuckles's theme, especially this line: "You can call me Knuckles/Unlike Sonic, I don't chuckle/I'd rather flex my muscles"
The chuckling line becomes funnier if you remember how in Sonic 3 & Knuckles, he chuckled a lot as he antagonized you while Sonic did no such thing.
After completing the Sky Deck and leaving the pool in Knuckles' storyline, there is a cutscene in which Knuckles witnesses Chaos' transformation into Chaos 6 some distance away. It would be an okay scene, but for some reason the game plays his "drowning" death vocal, making it seem like he drowned in air.
Even though Sonic Adventure 2 was made in America, the script apparently got translated to Japanese and then back into English, rendering lines that were only sometimes comprehensible, rarely synced to the mouth movements, and even overlapped each other. "He must be using the Chaos Emerald to wa...[rp]" "[My]...name is Shadow."
Let's not forget how some of the lines were left completely untranslated.
Shadow: Faker? I think YOU'RE the fake hedgehog around here! You're comparing yourself to me?! HA! You're not even good enough to be [my fake]!
Sonic: [I'll make] you eat those words!
Worse, sometimes the overlapping was between lines spoken by the same character. "Hey. It's not his spee[d]. [H]e must be using the Chaos Emerald to war[p]."
Then there's an instance where Eggman is supposed to cut off another character, but because of Japanese and English's different sentence structures, he reacts about a second too early.
Reporter: Mysteriously, the only thing that was stolen was th—
Eggman: The Chaos Emerald?!
Reporter: —aos Emerald.
Speaking of that scene, the news report could have been dramatic if the reporter wasn't speaking with some kind of mix-and-match accent made from bits of Australian, cod-Canadian, and rugby-ball-up-the-arse English. The strange part is that this seems to be intentional.
How has Sonic's finishing blow to the Egg Golem in the Dark story not been mentioned yet?
Add to the fact that this is one of the more serious Sonic installments, and the subtitles are in Comic Sans MS.
Tails' reaction to Sonic's (apparent) death was something of a Dull Surprise.
Tails: What have you done, to Sonic? I'll never forgive you for this.
Before the scene above, there's the scene where Sonic tries to give the fake Chaos Emerald to Eggman. When Eggman traps him, Sonic gives out a "Whoa.", while his mouth is stretched out to comically large proportions. Even worse, the "Whoa" is the same thing he says during playtime when the player has him an inch away from falling off a cliff.
During both Sonic and Shadow Duel Boss fights, if you're using Sonic and hit Shadow enough times, Shadow will drop these gems:
To add another Adventure 2 Battle line to the mix, during the final fight of Dark (Shadow vs. Sonic), whenever Sonic falls off the edge (which will happen a lot): "I'll use your technique! CHAOS... CONTROOOooOOL!" Every. Single. Time.
He stops himself mid-sentence most of the time. "I'll use your — CHAOS CONTROL!"
Sounds like Sonic is throwing a Pokeball containing Chaos Control...
In the Dreamcast version, Sonic just says "I'll use... CHAOS CONTROL!".
"I'm not done with yo[u yet!] — SONIC WIND!
Sonic and Shadow's second battle with each other is full of Narm, no matter which side you're playing. The equivalent to Sonic's above quote is Shadow's, "THIS IS THE ULTIMATE!"
The above cases are rare examples in which the player is largely responsible, as Sonic and Shadow's lines ("I'll use your technique! Chaos Control!" and "This is the ultimate power!", respectively) can be cut off if the player zooms too far ahead of their rival during the utterance and subsequent Chaos Control warp, causing the dialogue to skip ahead so that the A.I. can keep up with the player.
Before their first battle in Green Forest on the Hero side, you see Shadow jump down onto the platform Sonic's on. While it looks cool, Shadow's model does not have a mouth and has hilariously drooped down eyebrows, all while he's saying, "There's no time to play games. You won't even get the chance!", as if Shadow is a wet blanket that doesn't want Sonic to have any fun.
The final fight with the FinalHazard. The Biolizard's merged with the Space Colony ARK to expedite its descent onto Earth, so Super Sonic and Super Shadow head out to stop it. The battle itself is epic, complete with Crush 40's Live and Learn blaring out, but the final boss itself becomes a lot more silly, since it looks more like the Biolizard has the ARK's Eclipse Cannon shoved up its arse.
The President's in-limo conversation with Robotnik. "Just what is it that you want...Doctor Eggman?!" and that isn't a typo, he does indeed put in a small pause before "Doctor Eggman?!" The way he says Egg-botnik's name there is badly timed, looking as if something happened to the doctor or he put on a rather silly hat.
Sonic's delivery of the line, "BLOWS UP?!"
Adding to that, in the Hero's Story, Sonic says this line, as well as the line, "I've got to find Amy and Tails right away!" with his teeth clenched. He actually moves his mouth on the Dark Story, but that doesn't excuse how he can do that in the Hero's story.
Not to mention Shadow with his mouth hanging open the whole time.
"My power is FAILING!"
In the last story, we have this hilarious moment. The colony starts falling, Sonic and Knuckles feel the sudden vibration and realize something bad is happening. Rouge appears and explains the situation in a complete deadpan... And then she opens her mouth and eyes widely, after Gerald's last message suddenly pops up on a screen nearby.
The last story. Sonic and Shadow are preparing to go into their super forms to fight the Biohazard and save the earth. Knuckles watches them, transfixed in awe...with the derpiest expression ever on his face. Summed up best by the Great Clementhere.
Shadow: *talking to no one* It all starts with this... *holds Chaos Emerald over his head* a jewel containing the ultimate power! 
Shadow: *speaking slowly* I've been waiting for you, Doctor. Now, I will show the glooorious achievement of what the world's leading scientist - Professor Gerald - has created. (...) A weapon capable of destroying an entire planet. *points finger skywards* Codenamed: The Eclipse Cannon! *clenches hand into a fist* (...) *extends arms to the sides* Once you have that, then you have the ultimate power of destruction to use as you please. And then... the wooorld... could be yooours! 
Let's show that creep THE REAL SUPER POWER OF TEAMWORK! Yeah, because WE'RE SONIC HEROES! Actually, the entirety of Sonic Heroes was pretty Narmy.
He really elongates the "NO" there and can't decide between screaming it and growling it. It sounds very silly, especially when Espio's now portrayed as a ninja, if not then a parody of anime ninja. It's surprising that Sega hasn't had him recite the Kuji-In yet.
This is made especially comical because the captions put the emphasis on the word "fourth" instead, even though there is absolutely no such emphasis in the dialogue.
They seem to put a huge emphasis on the word DAMN every time Shadow spouts it off, almost as if flaunting that it's supposed to be Darker and Edgier than the mainstream series.
The expression on the GUN Commander's face when as a child he saw Shadow's creation. There's a reason it's the page picture...
Not helping this scene was the introduction before it, in which the GUN Commander gives a speech about Maria being like his sister over a flashback of the two of them on the ARK. Would have been more dramatic, except the GUN Commander as a kid tauntingly spanks himself as if to say that Maria can't catch him, all while on a big, dramatic space station. And the gesture looks very, very silly.
The fact that the GUN Commander as a kid had such a horrified reaction to the sight of a cartoon hedgehog after cheerfully playing around in the same space colony that housed the creation of dangerous research projects like a giant mutant lizard and the berserk bionic clones of a god that destroyed an ancient civilization. This was apparently traumatic enough for him to blame Shadow for the death of Maria and to try to get revenge on him by joining the very organization that was actually responsible for her death.
Black Doom has a Narm scene in the Last Story, when he sics his Black Leeches on the paralyzed heroes: "Ah, my dear offspring... eat and devour these savory dishes!!!" Cue the Black Leeches just squelching about in front of Sonic and friends while the furries (and Eggman) completely overreact. Seriously, the Special Effects Failure just totally wrecked that scene.
The way Shadow speaks, clutching his chest like he's suffering heart failure, or putting in dramatic pauses every few seconds, is pretty narmy.
Shadow's ridiculous barrage of expletives whenever he gets attacked.
After Shadow falls...
Shadow: Damn! Not here!
Upon discovering Eggman's fleet of Shadow Androids, Shadow goes on to utter the following line with downright Shatnerian diction:
Shadow: Shadow.... ANDROID?! Am I... an... android TOO?!
During the Glyphic Canyon level, when you've got Knuckles with you, has a segment where you have to walk into this tornado to progress. What does Knuckles have to say while you're doing this? "HELP!!!WE'RE BEING SUCKED IN!!!" This is made much more hilarious for two reasons: the first is that Knuckles is voiced by the gloriousDan Green, and the second is that, if you wait around on the bridge for a bit, Knuckles will tell you to walk into the tornado.
The GUN Commander's exposition rant to Shadow just before the Cosmic Fall level. Quite profound and dramatic and would be very much so in a more serious game... if not for the fact that, gun aside, the scene looks quite comical when he's ranting about this to a nearly adorable cartoon hedgehog.
Sonic the Hedgehog (2006) did have some. This is especially due to the contrast of the kind of realistic humans and the animal and human contrast during the drama scenes, the nonsensical plot, the dialogue, and moments of pure silliness like Eggman or Tails pressing buttons like he was a cartoon.
At least Eggman's moments are So Bad, It's Good. The scenes with him in are pretty much one of the few bearable bits of the game's plot.
In Sonic's boss battle with Silver. "It's no use". While meant to cause fear, surprise, or even wonder, it quickly becomes Narmy, and even more quickly becomes frustrating, especially after the 20th or 30th time.
"That tornado is carrying a car!"
Besides carrying cars, the tornado is also sentient (throws cars in front of Sonic) and stops when you finish the level, just hanging out in the background while Sonic poses.
Sonic's "Test of Love". If an oracle using "Dramatic" lines to tell you to choose between two girls in a mission that's so random it's basically a Big Lipped Alligator Moment isn't enough for you, keep in mind that this supposedly dramatic choice used the same upbeat little tune all the other missions use.
During the final boss of Sonic's story, Eggman will occasionally yell "Fall!", sounding less like an evil genius trying to kill you and more like a little kid who was one pin away from getting a strike in bowling.
The orchestrated music during Dark Gaia's final form sounding like he and Super Sonic should be breaking out in vaudeville-like show tunes at any second instead of fighting.
If there was ever a reason for the concept of fan art to exist, this would be it.
Seriously, that whole scene was Narm, but the music was actually what saved the final battle. Just because a song lacks electric guitar doesn't mean it's vaudeville music.
You didn't expect the final battle to play the all-happy Endless Possibility from the opening sequence, did you?
Speaking of Unleashed's final boss, Chip's super awkward grunts deserve a mention.
Come to think of it, anything Chip says during the final fight is just awkward and pretty narmy.
Rouge the Bat in every appearance, especially for her... bouncing... In her first appearance, half of us were busy laughing at how unrealistically she moved; the other half found it... interesting.
The 3DS version of Sonic Generations attempts to convey the plot of the console versions to the best of its ability. Emphasis on "attempts". There had to be a better way to convey destroying Eggman's robots or making a Heroic Sacrifice than having 3D models slide past what appear to be trading cards.
The face Classic Sonic makes when he's surprised. He just stands there with a gaping mouth, wide-eyed (keep in mind Sonic's two pupil, one eyeball design) stare.
The battle the two Sonics are supposed to have with Eggman before the final boss is butchered in this version. The game portrays the battle with still images, cheap visual effects, and text boxes. It gets especially confusing when Tails enters the fight.
The most narmful moment in the console/PC version of Sonic Generations has to be Modern Sonic's parting words to Classic Sonic: "Enjoy your future! It'sgonnabegreat!"
Sonic and the Secret Rings gives us Erazor Djinn's final form: Alf Layla Wa Layla, mainly it's voice. It's meant to sound echoey and distorted to show how powerful he's become, but the effect used for it is just awful. He ends up sounding like a demonic chipmunk as opposed to a monstrous abomination.
Sonic Shuffle: Lumina and Void's constant angsting.