Sleepaway Camp!
You probably don’t have time for a movie this late on a Monday night, and that’s a shame, because I got a good one for ya:
Sleepaway Camp, from 1983! Usual content warnings apply — this is a total R-rated slasher film in all directions. Certain aspects of the movie arguably haven’t aged well through today’s lens, but it’s way interesting regardless. (PS: The sequel, Sleepaway Camp II, is one of my all-time favorite horror flicks.)