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Nightmare Fuel: The Mummy Trilogy
In the backstory of the first film, Imhotep is sentenced to endure a horrible curse known as Hom-Dai, which grants eternal life, which involves cutting his tongue off. He is then devoured by scarabs so that he'll eternally have to endure the agony of his wounds. His fellow priests don't fare off that much better, they are mummified alive!
Worse in the novelisation, which has the latitude to go into deeper detail about the curse without pacing or rating issues. It seems that the curse was designed to work in a twisted mockery of the "circle of life"- Imhotep is eaten by the scarabs, and eventually becomes so ravenous that he begins eating them, they eat him all over again...
The scene at the prison when Rick almost strangles to death at the end of the hangman's noose is... somewhat unsettling. Unpleasant enough that it's cut from a lot of television showings, put it that way.
The scenes where Imhotep re-makes himself out of bits of living people...
The blue gold scarab. The real thing breaks out of the pretty shell and kills a man by tunnelling through his flesh... and eating his brain.
The scarab crawling out of Imhotep's neck, back through the hole in his cheek, and he bites down with a crunch.
Beni's eventual fate. Trapped in a dungeon that's just been permanently sealed under the desert, only a single torch to keep you safe from the flesh-eating Scarabs which are gathering around you, and you have to sit there and watch while they surround you and you watch the torch slowly... flicker... out.
In the second film, there's a moment where Ahm Shere is returned to its former glory. It is done so by a museum curator wearing the bracelet putting his arm into a hole in a stone statue. I don't think I want to know what that crunching noise was and why he was screaming in pain...
In the third film, the Taken for Granite aspect of the Terracotta Warriors. It's not so much the fact that they are this since you see that in many a movie (though it's still quite unsettling), but the process. Just... watching them as they start to liquify from the mouth, the wet clay leaking out as it spreads and takes over their forms, hollowing their bodies out, covering them... Brrr!
The second movie starts off with an archeological dig. One hole is dug up into a swarm of scarabs, which begin attacking people. One guy manages to make it out, only to see bulges moving around under his skin before the bugs come out of his mouth.