Friday the 13th is a 1980 American slasher horror film directed by Sean S. Cunningham and written by Victor Miller. The film concerns a group of teenagers who are murdered one by one while attempting to re-open an abandoned campground, and stars Betsy Palmer, Adrienne King, Harry Crosby, Laurie Bartram, Kevin Bacon, Jeannine Taylor, Mark Nelson and Robbi Morgan. It is considered one of the first "true" slasher movies. Wikipedia
Alice: The boy... is he dead, too? Tierney: Who? Alice: The boy. Jason. Tierney: Jason? Alice: In the lake, the one... the one who attacked me... the one who pulled me underneath the water. Tierney: Ma'am, we didn't find any boy. Alice: But... then he's still out there.