"Halloween" remains one of the most frightening and influential horror films of all time. 

Evil never dies, as is evidenced in the case of Michael Myers, the mask-wearing serial killer from 1978 slasher fave "Halloween." No matter how many times he's shot, stabbed or blown up, nothing can stop Michael from slaying countless numbers of unsuspecting teenagers. That creepy sense of utter futility in the face of evil, coupled with the haunting theme music, plays a big role in why this film is so unnerving. The success of "Halloween" spawned a host of similar murderous flicks ("Friday the 13th," "Nightmare on Elm Street") and established a legacy of memorable horror movie clichés. Amazingly, although the movie itself doesn't contain much graphic violence or gore, "Halloween" is still one of the most frightening and influential horror films of all time.