Wacko is a 1982 American comedy horror film produced and directed by Greydon Clark, starring Joe Don Baker and George Kennedy.

[1] In the film, a police officer is obsessively investigating a cold case involving a spree killing on Halloween night.

Thirteen years ago, on Halloween, a man wearing a pumpkin head and driving a lawnmower murdered several children.

Jeremy Wheeler of AllMovie gave the film one out of five stars, and wrote: "Wacko virtually vanished from the face of the earth, which, as it turns out, isn't necessarily a bad thing.

"[2] Chris Coffel of Bloody Disgusting praised the film's "frenetic energy" and "killer ensemble cast", writing: "Wacko is not a movie everyone is going to love or even like.