These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Adult Fear: Look at it from a parent's point of view. Your daughter is ill, there's nothing you can do about it and no doctors or medicine can help her.
Awesome Music: The perennially-creepy Tubular Bells.
Moral Event Horizon: If Pazuzu's possesion of Regan wasn't bad enough, when he posseses Karras at the end, he immediately moves forward to KILL Regan since he doesn't need her anymore. Bastard!
Memetic Mutation: Ever saw a screamer? If yes, there's a 99% chance demon-possessed Regan jumped in your face at least once.
Or an image of Captain Howdy.
Narm: Most people find it scary, but quite a few find it downright hilarious mostly due to just how over the top it gets: a good example would be the restored spider-walk scene.
Nausea Fuel: Most people were physically ill and fled theaters during the medical scenes, especially the spinal tap.
CanonDiscontinuity: In the third film, Fr. Morning disappears and reappears in the padded cell, chiefly due to the Executive Meddling described below, of adding the character post-production.
Misaimed Fandom: In general, this seems to be averted; most viewers tend to see the Gemini as a terrifying villain, nothing more. However, this was played very straight with one person: Real LifeSerial Killer Jeffrey Dahmer. According to forensic psychiatrist, Park Dietz, Dahmer viewed the Gemini as something of a personal role model because of the power he was able to wield over his victims and captors. He also liked the character of Emperor Palpatine for the same reason.
Surprisingly Improved Sequel: After the embarrassment that was Exorcist II, The Exorcist III with George C. Scott turned out to be a pretty damn good little horror movie; some think it's horribly underrated; and a few (admittedly very few) even go so far as to say that it's both better and scarier than the first movie.
