Friday the 13th Part 2 (1981) ending / spoiler
Jason's head is finally revealed they slice into his shoulder with a machete "killing" him. The girl and her boyfriend go back to the cottage. Jason jumps through the window (you can see his deformed face) and kills her boyfriend. She gets knocked out, then wakes up later and is on a gurney getting loaded into an ambulence. They don't find Jason.
Submitted by Chris $immons