* If you're a kid, the scenes with the evil clown puppet and the carnivorous tree are straight out of Hell. If you're a parent, the mother's struggles to reach her endangered children, as corpses pop up out of the pool and floors all around her, are even worse. And the bit where the researcher [[spoiler: claws at his own disintegrating face in the mirror]] gets to everyone.
* What about when the ''giant flaming skull'' pops out of the portal in the closet? Far more what it represented. Steven was told ''not to pull on the rope'' by Tangina - he did it anyway, and what came out attached to the rope wasn't his wife -- it was '''''the beast.'''''
* And the simple fact that it all unfolds in somebody's home, not out in the woods or whatever, is pretty creepy. How many people who watch this for the first time can avoid looking suspiciously at their closet doors for several nights?
* Critics initially blew off this movie as "not scary enough" because nobody gets killed messily. But seriously - ask any parent how they would feel [[AdultFear to see their five-year-old dragged off by malevolent spirits, unable to reach them or stop it]].
* The chairs stacking themselves offscreen. So simple. ''So'' threatening.
* The movie has an uncanny tendency to have long scenes of relative calm and normalcy (even after the poltergeists have made their presence known) only for the HSQ to suddenly turn up out of nowhere as things start bursting out the closet, toys start moving around on their own, and bright lights start shining. It has a thoroughly unnerving effect.
* A bit of EnforcedMethodActing, said to have been Spielberg's idea. Some of the corpses in the final scene were ''real.''
** Not some of them were real. ''All'' of them were, as using real skeletons was cheaper than getting plastic ones.
* Don't forget the very, very end of the film, where the theme music stops and turns into creepy children's laughter, which continues even after the title fades. Not horrifying, but it's definitely unsettling.
* Tangina's expository monologue, detailing exactly what was going on in the house and what they were up against.