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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!
The Mummy. The scenes where the mummy re-makes itself out of bits of living people...
The gold scarab suddenly turning alive and killing a man by tunnelling through his flesh.
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 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!