with a few exception and most horror film be scary but there a certain unreality to them . you watch them and jump when youre mean to jump and you scream when youre mean to scream and but at the same time youre think that this could never happen to you . head case be different . the way it film a to be edit from home movie certainly help to make it seem realistic and but even more so it the way the character act and interact . so many of the exchange between the husband and wife be just so . ordinary . their bickering tend to be rather boring and something you have hear a thousand time from listen to your dull neighbor . at time i begin to tune them out . however and when theyre planning or carry out their horrific murder and theyre just a casual about it . the way they can nonchalantly describe to each other the way a woman be chew up ground glass or how it so difficult to saw through a spine and a though theyre do nothing more than talk about the weather and be what make this film so absolutely chill . this film be so realistic and it have to be one of the most horrifying i have ever see . i will never again accept a car ride or a glass of ginger ale .