the thing that make this movie so scary be the way that it portray andre and calvin a ( relatively ) normal guy . these be definitely not people who want to become professional filmmaker since they goof around in front of the camera and forget script line and etc . they be only make the video a a diary to show the survivor how normal their life be . their parent just think the guy be film for a family home video . by research other kid attack on their school and andre and calvin learn what not to do and they inform ( usually in a silly this old house kind of way ) any potential andres and calvin who might be watch this video how to make bomb and get weapon and and not get catch before zero day ( the day of the attack ) .