Pic related is mine. Such a solid movie. From being a critique of consumerism to racism, to an action movie, to comedy at some points. And while it might not be scary in the traditional sense, the opening scenes detailing the chaos around a news station trying to remain calm during the end of the world are done pretty well and set the mood for surviving the apocalypse.
An American Werewolf in London is probably my favorite halloween movie. I would say The Thing, but I typically leave that to a super cold and rainy night in december