The scene that stands out more than the rest, in terms of fear is when Jack is locked in the walk in pantry.  First of all, the first shot shown is Jacks unconscious face being dragged along the floor. The camera is tracking, so his face does not go off center. When Wendy is unable to open the door, Jack is regaining consciousness, she begins to cry because her husband is going insane, and wants to kill her and Danny. The sounds in this scene are in perfect harmony in the sense that you can hear a few different sounds that are going on at the same time, but they come together to instill fear in the viewer.  The scariest part of the scene is when he is yelling at Wendy and he is shown from under. The sound while he is trying to reason with her makes you think that she might let him out, but when you see his face you know its a facade.