You take a backing track from an episode of how it's made and record yourself shrieking and hyperventilating over it
That's because that's where one of the earliest examples of the genre originates

Avatar by @DrDubz.
Banner by one of Colin Jackson, Rick Lodge, Steve Noake, or David Severn from Bubsy in: Fractured Furry Tales for the Atari Jaguar.
You take a backing track from an episode of how it's made and record yourself shrieking and hyperventilating over it
That's because that's where one of the earliest examples of the genre originates
I'm still not fully convinced this isn't an elaborate joke and the movie is actually a completely normal film
Mister police
You should have prepared yourself
I gave you all the clues