If you are looking for high-concept sci-fi, keep walking. But if you want a greasy, gleefully absurd slice of 90s cult cinema, look no further than The Invisible Maniac (1990) . Directed by (credited as Rif Coogan), this film is a bizarre hybrid of a slasher flick, a Porky’s -style teen comedy, and a sci-fi parody. The Plot: Invisibility Meets Insanity

The movie follows (Noel Peters), a brilliant but deeply repressed scientist with serious mommy issues. After his colleagues laugh at his failed invisibility demonstration, Dornwinkle goes on a murderous rampage, lands in an asylum, and eventually escapes to hide out as a high school physics teacher.

Naturally, he spends his time perfecting his serum and using his newfound power to spy on his students in the locker rooms. When the students begin to prank him, his "maniac" side takes over, leading to a spree of creative, low-budget murders. Why It’s a Cult Classic The Invisible Maniac (1990) - IMDb

Retro Review: The Invisible Maniac (1990) – Pure B-Movie Madness