M
That's right, this one is just called M. When a serial killer sets his sights exclusively on hunting children, an unnamed city begins to implode. It takes a village, or in this case, an entire secret gang of criminals, to take this villain to justice. Though you might have never seen it, this film set the precedent for all serial killer movies. That, and this movie still holds up nearly 100 years after its conception
Scream
This 1996 thriller might be a little far fetched, but it certainly is unsettling. Stars like Neve Campbell, Drew Barrymore, David Arquette, Courtney Cox, Rose McGowan all show up in this film that pushes the boundaries of modern moviemaking and coming of age films all at once.