The Amusement Park

The Amusement Park is a 1975 American horror film directed and edited by George A. Romero from a screenplay by Wally Cook. It stars Lincoln Maazel, Harry Albacker, Phyllis Casterwiler, Pete Chovan and Sally Erwin. Filmed in 1973, it was commissioned by the Lutheran Service Society of Western Pennsylvania as an educational film about elder abuse. The Amusement Park is one of Romero's only films to be devoid of supernatural elements.

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

Poster © the film's rights holders.