Crazy as a Soup Sandwich - S3-E29
Revealing mistake: The Styrofoam head Gus tears in half shows it has been pre-cut, making it easier for him to rip in half.
Crazy as a Soup Sandwich - S3-E29
Revealing mistake: The supposedly heavy cardboard boxes Gus, Bork and Arky pile against the door are very light and obviously empty.
Answer: Poisoned food, heart attack from eating too much food, or he slipped in the shower. The list is endless.