Eccentric fisherman Lewis catches a frogman who is searching for sunken treasure. The frogman hands Lewis a map, mumbling something about diamonds and their hiding place, before a gang of thugs in a power boat show up to kill him. From then on, it's one long, tiresome chase after Lewis to
obtain the map, a take-off on IT'S A MAD MAD MAD MAD WORLD filmed four years earlier. Lewis relies on pratfalls, screwball expressions and berserk mannerisms for laughs.