Evil Laugh

Evil Laugh is a 1986 American slasher film directed and starring Steven Baio, Kim McKamy, Tony Griffin, Jody Gibson with Johnny Venocur and Dominick Brascia, Jr. The film is about a group of medical students attacked by a masked killer while repairing a building over the weekend.

Synopsis from Wikipedia, CC BY-SA 4.0. Everything below written here.

Poster © the film's rights holders.