Friday the 13th

In the first movie, a group of teenagers return to a summer camp, Camp Crystal Lake, to prepare it for reopening. Many years earlier, a young boy named Jason Voorhees had drowned at the camp, and shortly thereafter, the two counselors responsible were murdered by an unknown assailant, after which the camp was closed. After unsuccessful tries to reopen the camp, it is finally reopened. One by one, the new counselors are brutally murdered, it transpires, by Jason's mother, Pamela Voorhees.

Notes:
* Betsy Palmer agreed to be in the film only as a means to pay for a new car, believing the film to be trash.
* The film was shot at Camp NoBeBoSco in Blairstown, New Jersey.
* The scene with the snake was not in the script and was an idea from Tom Savini after an experience in his own cabin during filming. The snake in the scene was real, including its onscreen death.
* The character of Crazy Ralph who warns the would-be counselors not to visit Camp Crystal Lake inspired filmmaker Tony Urban to name his company Crazy Ralph Films.