You need to watch the found footage classic, Lake Mungo
Found footage movies are tough to pull off. For every classic like The Blair Witch Project or Rec, there are 100 movies like Slender and Megan Is Missing that are, at best, forgettable, and at worst, an affront to the very concept of cinema. My personal favorite, though, is Lake Mungo, a slow burn mokumentary with found footage elements that manages to be both creepy and emotionally wrenching. Oh, and it's gloriously concise at under an hour and a half.
Lake Mungo is, first and foremost, one of the most convincingly realized mokumentaries ever made. If you told someone it was a legit documentary about a supposed haunting, there's a chance …