The "second victim" scene. Never seen anything quite like this, it's imagery that just sticks with you. Everything is so minimalist about the scene, but it's crafted perfectly. The setting is bizarre/alien enough, but the score is really what makes the scene. Then after he descends, you just really feel a sense of dread for the guy watching what he knows will soon happen to him. THE most effective jump scare I've ever seen when he "pops". The wrinkles on the skin, the tears in the sheet-like body afterwards, just such an amazing scene visually.

Charlie's "Accident" scene. Even people who don't like the movie were impacted by this scene. Saw this movie in a theater a couple times, and was really curious to see the audience reaction the 2nd time I saw it. There was a group of late-teens/early 20s kids behind me that were talking/laughing for the first part of the movie (nothing obnoxious, just audible). When that scene happened, you could hear a pin drop and then one of them kind of shockingly said "WTF just happened???"

I think it's just a really well-executed scene. You think she's going to be the focal point of the movie, so you don't really believe what happened the entire time the camera is focused on the son. And then when you hear Toni Collette absolutely nail it with that scream/sobbing on the ground, you learn along with the character what happened. The head just kind of brings it home.

Meeting Black Philip scene. I just love how understated this is, while still giving you enough that is befitting of a climactic scene. Reminds me a lot of the type of horror you'd see in Rosemary's Baby. The whisper is something that could come across as hokey, but for some reason it doesn't. I love that you don't get a good glimpse, but rather just see him lurking in the shadows, and get cool little glimpses of the goat's hoof turning into a man's foot. There's also something that is incredibly unsettling about how he puts his hands on her when she removes her shift.