...you will probably also like 'The Blackout' and 'Skyline' too. Cloverfield is the best of them. They all have that ordinary event going on when all of a sudden something big happens that threatens human existence. They also make zero attempt to explain how or why the something big is occurring and focus solely on the action and battle for survival. Similiar films that DO have an explanation tied into the storyline include 'The Mist' (awesome film imo, tho the threat is more local than mankind) and 'The Happening'. 'Infestation' is a weird and pretty funny one in places, again a local threat but incorporates the sudden event occurence that leads to that survival action. Anyone know of any similiar films? I'm really liking this kind of 'lacking explanation, maximising action horror/sci-fi' film.