In one of their all-time great, gut-bustingly guffaw-filled films, their first based on an original screenplay instead of an adaptation of one of their Broadway shows, the Marx Brothers – Groucho, Harpo, Chico & Zeppo – set sail for hilarity as stowaways on an ocean liner. But their transatlantic antics get them mixed up with gangsters in a madcap display of comedic calamity.