Night Life (1989)

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.