'Cloverfield'

This film somehow managed to develop a cult following before it was even released. When the creepy teaser trailer -- which purposefully neglected to include the title of the film -- began making the rounds in 2007, people had all sorts of theories. In the end, it turned out to be an unnerving monster movie set in New York City, shown through the perspective of a man documenting everything on his handheld camera -- including his (SPOILER ALERT) own death.