Joe McBeth is a hard-working but unambitious man who toils at a hamburger stand alongside his wife Pat. Pat is convinced she could do a lot better with the place than their boss Norm Duncan is doing, so she works up a plan to usurp Norm, convincing Mac to rob the restaurant's safe and then murder Norm. Though two stoners and a would-be fortune teller warn Mac that bad luck awaits him, he gathers his courage and goes through with his wife's scheme. At first, things seem to have gone just as Pat hoped, and after Norm's sons sell the restaurant to them, business takes off. But vegetarian police detective McDuff is convinced there's foul play at the new center of the fast food universe. Added to this, the McBeths fear that fry cook Banco knows more than he's letting on, leading Mac to take charge in the plotting department and decide there may be more dead meat on the menu.