The Incredibles/Nightmare Fuel

"Helen: Abort, abort! There are children aboard, say again, there are children on board this plane!"
 * "Remember the bad guys on those shows you used to watch on Saturday mornings? Well, these guys are not like those guys. They won't exercise restraint because you're children. They will kill you if they get the chance."
 * After he believes his family has been killed, Mr. Incredible: "Why are you here? How can you possibly bring me lower? What more can you take away from me?" While Mr. Incredible is saying this, he has Mirage in a death choke, is holding her a good three-four feet off of the ground and her face clearly shows pain and on the verge of passing out because he's restricting oxygen flow.
 * "I can't lose you again. I can't. Not again. I'm not s-strong enough."
 * The list of supers killed, lured to their deaths during the Omnidroid testing. Really, how could anyone see Syndrome as a sympathetic character after that? Especially when you consider that these are people Mr. Incredible knew personally; look closely, and you can see most of them at the wedding. The increasing horror on Mr. Incredible's face certainly doesn't help either.
 * It's even more chilling if you remember from the start of the movie that all of the supers are simply trying to live as normal folk and during the dinner scene where Mr. Incredible is reading the newspaper, we see that the recent missing person used to be a super. We see him later as a corpse in a cavern.
 * Even worse, all of those people must have gone through the exact same arc as Bob did. Feeling unfulfilled with normal life, the supers were approached by Mirage, given a mission, kept coming back, felt good about themselves again...and then they were killed by the ever-evolving droid.
 * On the complete opposite side of the spectrum, the deaths of all those Mooks. There were many more Mook deaths than Super deaths, and they could've just been Punch Clock Villains.
 * That said, there were Mooks playing a Drinking Game of what the Omnidroid did. And who knows, it could have been killing innocent civilians).
 * Dash's high-speed chase with the velocipods becomes a lot more chilling when you realize he causes the death of about 8 people, the highest on-screen body count in the film. From a kid who's about 10. But, it's horrifying from the other side, too—multiple adult men are deliberately and completely knowingly trying to murder a ten-year-old for pretty well no other reason than, well, trespassing.
 * Also,
 * This was foreshadowed by the exact same thing happening to a good Super. While she was waving at a child in the airplane. The special features note that she was a teenager.
 * Strata-Girl, the super hero dragged through the plane turbine by her cape, is dragged through head first!.
 * The Electric Torture was rather disturbing, especially for something in a PG-rated movie. Made even worse in that Syndrome's expressed motive for it (the victim "sending out a distress signal") is something the victim did entirely by accident in the first place; Mr. Incredible wasn't even aware of the homing device and when he tried to tell Syndrome this, it was immediately dismissed as lying.
 * *Rotate* Danger *Whiirrrrr!!*
 * And let's not forget how Mr Incredible came to be caught beforehand - having dozens of unremovable black "balloons" fired at him as he struggles to escape, which begin to expand and completely engulf the protagonist. The point-of-view shot of Mr Incredible's quickly-fading vision is chilling, especially for anyone with a fear of confinement or suffocation.
 * For the aeronautically-inclined, hearing Helen's voice-overs as the missiles approach and ultimately destroy the plane is pretty scary, especially if you imagine hearing it over a black box.


 * Mirage's reaction to hearing that is about the same as that of the audience—dawning realization turning into horror.
 * After the battle with the robot, Elastigirl is checking voicemails, and hears the babysitter that Violet hired to watch Jack-Jack panicking over the phone about her infant son. Just when it comes to a head, the girl calms down and thanks her for calling a replacement sitter. The full force of the moment floats right over the heads of younger viewers, but the look of abject horror on Bob and Helen's faces and Helen's frantic, "I didn't call a replacement!" is terrifying to older audience members.
 * "I mean, after all, I am your biggest fan."
 * "He's getting away, Bob! We have to do something, we have to do something now!"
 * The angry look on Buddy's face after Mr. Incredible tells him "I Work Alone".
 * In the alternate opening on the deleted scenes, there's this really creepy moment after Syndrome hears baby Violet crying and then says to Bob, "You are breaking the law, Mr. Incredible. You know supers aren't supposed to breed," his eyes just slowly move in the direction of Violet's room. There's something very unsettling about that moment which cranks up Adult Fear to the extreme. Syndrome has Bob and Helen trapped with his freeze ray and there's nothing they can do to stop Syndrome as he moves down the hall toward Violet.