The test of a truly great horror movie is whether it can still scare the pants off of viewers even after repeated viewings. CG monsters may come and go, but the shark from "Psycho" will live in our nightmares forever.

As we get into the Halloween spirit, we're looking back at 10 iconic horror moments that have stood the test of time. No matter how many times we watch these films, these moments always fill us with dread.

1. The Chest Burster Scene From 'Alien' (1979)
Poor Kane. Just when this plucky space trucker thought he had emerged from a close encounter with a Facehugger none the worse for wear, he found himself being devoured from the inside out. The fact that the actors weren't expecting the Chestburster any more than the viewers really made this scene that much more visceral.

6. Ben Gardner's Boat From 'Jaws' (1975)
Can't fault us for having two scenes from "Jaws." This second jump-scare is a perfect example of why less is often more when it comes to horror. The tension of seeing Hooper dive into the water when a giant, man-eating shark could be anywhere in the area was bad enough. The shock of seeing the bloated corpse of Ben Gardner rear its head is enough to haunt our dreams even still.

10. The Shower Scene From 'Psycho' (1965)
Is there any place people feel more vulnerable than in the shower? "Psycho" certainly didn't help, as this dramatic murder (punctuated by some truly creepy string music) quickly became one of the most iconic horror scenes in Hollywood history.