John Landis' film hinges on the basic concept of a family who are very, very stupid. Stanley Stupid (Tom Arnold) discovers that every time he puts his garbage out, somebody steals it. He manages to trace it to a garbage dump where, coincidentally, two renegade US army officers are negotiating an arms deal with terrorists. Oblivious to this, Stanley continues his pursuit of the garbage thief, whom he surmises to be a man called Sender; the same man who steals undelivered mail (as in 'Return to Sender'). Watch out for cameos from well-known directors.