Spoony speaking in Ma Ti's voice is incredibly disturbing.
This is almost made worse in the end of Part 3, when Spoony is arguing with himself/Ma-ti.
This is definitely worse in Part 7, even if it only happened for a few seconds. Plus the hint that Ma Ti has well and truly flipped.
The sequence where Ma Ti sends information about the Hole to different computers while Spoony convulses uncontrollably in his chair is very eerie. And then it makes the Critic's computer blow up, while Chick's computer is also getting the messages.
What makes it so shocking is the buildup: the dialogue (and the usual goofy nature of Mickey's character) leads you to believe that the exchange will end in a slap fight, or a humorous parody of The The Incredible Hulk; instead, the scene cuts abruptly. And then Mickey enters the control room, and we see the bloody aftermath....
The crew tries to pull up Prick on the screen... Their disgusted reactions allow the viewers to imagine just how mangled he might be.
The words "HELP ME" written on the back of Mickey's shirt in splattered blood.
Whatever Mechakara...does to Nostalgia Chick. There is a drill involved. And her crying out as he... does whatever he does to her. And everyone else writes it off as sex! Todd's assimilation was even worse- the drill was bigger, and when he walks he makes horrible machine noises...
The end of Part 5: Ma Ti demands the Critic go inside the plot hole, while Mechakara, Chick, and Todd are doing...something...to the ship.
Spoony's perception of his own superego. It's not simply because he's completely nude save for a thong, its that his limbs look unnaturally skinny.
His view of Critic is also creepy. For whatever reason probably best left to him, Doug is moving like a wind-up toy.
What happened to Film Brain in Part 6: after being strapped to an experimental, highly likely to kill you, device, he is trapped there as everyone else is unconscious and the oxygen is on the bridge is dropping. He ended up yelling himself hoarse without anyone hearing him.
Mechakara shaking violently and letting off a vibrating, mechanized roar of pure animal rage when he learns that Terl lied to him about knowing the secret of Malachite's Hand. It's also compounded by the fact that he's missing half his face, and shows how truly horrifying and monstrous he is when you really piss him off or attempt to double-cross him.
While just a brief moment, when Mechakara came back in Part 8 to get his revenge against Terl while on the latter's ship, he's first seen through a security monitor and then looks at the security camera, pissed off, out for blood and knowing either Terl or Zod is watching, plus the red glow of his damaged eye made things more frightening. Him also saying "Remember me?" to ZOD in a VERY angered tone before slamming his face mutliple times against the couch made it more frightening.
When Mechakara shows up on the security monitor in part 8, look closely in the background. You'll see two dead Mooks, one of whom is hanging on a door while the other one appears to have been possibly cut in half.....
Mat screams at Spoony while shaking him when he needs to know what's going on, and his roar is genuinely a shock.
The contrast between the Executor getting electrocuted in Part 5 and Luke getting electrocuted is quite apparent: while Rob is obviously hamming it up and mugging to the camera, Kinleynote Luke's real name after coming out sounds more like someone who is actually in pain.