Lake Mungo

This 2008 Australian mockumentary plays like a real true-crime documentary so convincingly that first-time viewers often Google whether it's based on actual events. The Palmer family's grief after their daughter drowns is presented through interviews, home video, and digital photographs that slowly reveal impossible details. The cell phone footage reveal is the single greatest scare in found footage — not because it's loud, but because it recontextualizes everything you've already seen.