Warner Bros. Entertainment

Arsenic and old lace: A drama critic about to marry discovers insanity runs in his family. A night at the opera: A New York scandal, a riot on a ship, and an evening of insanity in a concert hall are some of the problems resulting from Groucho's outrageous business schemes. The goal-- to bring Milan's finest opera stars to Manhattan. The long, long trailer: Newlyweds hit the honeymoon road with a 40-foot trailer in tow. Father of the bride: Chaos...