Melvin White, a neurotic, accident-prone cop who gets demoted to the night shift, secretly moonlights as the Unknown Comic, an anonymous stand-up comedian who performs with a paper bag over his head. When someone using the same guise commits a string of bar robberies in town, some begin to suspect that White is the culprit.

Danny Warren is a former minor-league shortstop that becomes a narc to uncover drug dealing in this situation comedy. Investigating at a high-school adult-education class, he falls for the tempting teacher. He joins a colorful group of characters that includes ex-cons, illegal aliens, and brain-dead baby boomers that cause more trouble than their younger counterparts. Swimming classes and wine tastings serve as background for a series of comic catastrophes.

爱达荷州一个小镇的有毒垃圾倾倒使一个小男孩变成了可怕的变种怪物。镇上的警察局长和一个政府科学家联手阻止了这个怪物，这个怪物很快就杀死了镇上的市民。