There aren't many movie slashers scarier than Michael Myers.  He doesn't crack wise like Freddy or chase you with a chainsaw like Leatherface, but his quiet menace is just as frightening.  This awesome mask is based off the Halloween II mask.  This mask only covers your face, so it isn't as hot and sweaty as a full over the head mask.  Pair it with overalls, a fake butcher knife and some fake blood to complete your outfit.