How about this ending scene from an early 80’s Charles Bronson movie.
There’s a scene in that remake of Nightmare on Elm Street that made me sink into my chair at the theater because it genuinely scared me
Can’t really put a vid of it here cuz of the gore. But heres how it goes
Freddie: Did you know…that after the heart stops beating the brain keeps functioning for well over 7 minutes? …We got 6 more minutes to play…