Killer Party 1986
Starts at a funeral where the corpse wakes up and kills someone, then pans out to show it's a movie within the movie being watched at a drive in.
Then one of the chicks in a car goes for popcorn, when she gets back to the car her BF tries to kill her and there are zombies everywhere.
Turns out this is now the start of a music video. Finally after 9 minutes it cuts to the chick watching TV in the actual movie.
So it's got a movie within a music video within a movie
or something
but yeah
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