The Stupids (1996)

Stanley Stupid (Tom Arnold) lives up to his name: He thinks the post office is sending him mail from a villain named "Sender" and is convinced his trash is stolen every night. He decides to pose as a tree to find out what's happening to his garbage and ends up at a meeting of global arms smugglers. Joan (Jessica Lundy), Stanley's wife, and their children, Buster (Bug Hall) and Petunia (Alex McKenna), go off in search of Stanley, who continually outwits a trained assassin.