13 Things You Didn't Know About Friday 13th: The Final Chapter

The climactic fight scene between Terri, Tommy and Jason in the house was choreographed to play straight through, with coverage to be added afterwards, and that meant that the timing had to be perfect.

That being the case, each scene was blocked and timed beat by beat, including the moment when Rob's corpse is thrown through the glass of the living room window, followed by Jason himself coming through the window behind Tommy.

Corey Feldman remembers waiting for Jason's big entrance... and waiting... and waiting. But Jason didn't appear. The cameras were still rolling, and he was just starting to think that something had gone wrong - a prosthetic had fallen off, the previous stunt hadn't come off properly on camera - when Jason came straight through the window with enormous force, a good twenty seconds later than planned, scaring the crap out of him.

Everything you see there is real... of course whether it was a mistake, or Zito messing with the kid to get the right reaction first time is up for debate.

Ted White, the stuntman playing Jason, really didn't like Feldman: in interviews since the movie he’s called him the “meanest godd*mn little kid” he’d ever met, and more than once gleefully mentioning the opportunity to put his mitts on him - so it's always possible it was Jason himself screwing with his victim...