Night Life/Grave Misdemeanors (1989) | HORROR/SLASHER | FULL MOVIE

Archie is a "brain" at a small town high school who works part-time at his uncle's mortuary and is harassed by a few of the popular kids because of it. His harassers die in an automobile accident, and the bodies are taken to his uncle's mortuary. Archie is pulling a late night at the mortuary when he sees a storm brewing. Lighting strikes! They're alive! The preppie bullies continue to torment him, as zombies.

IMDb: https://www.imdb.com/title/tt0097980