The Big Mouth

The Big Mouth is a 1967 comedy film produced, directed, cowritten, and starring Jerry Lewis released on July 12, 1967 by Columbia Pictures. It was filmed in San Diego and features Frank De Vol as an onscreen narrator.

As the police ignore Geralds story, Gerald heads to the Hilton Inn in San Diego where Syd claimed the diamonds were hidden. There he meets Suzie Cartwright Susan Bay, an airline stewardess. While searching for the diamonds, he needs to avoid the hotel staff after inadvertently hurting the manager Del Moore. Gerald disguises himself as a character noticeably similar to Professor Julius Kelp from The Nutty Professor, while trying to stay one step ahead of the other gangsters who are on his tail, as well as the hotel detectives led by the managerall the while courting Suzie. As each of the gangsters see Gerald, an identical lookalike to the deceased Syd, they have nervous breakdowns one imagining himself a dog, one turning into a Larry Fine lookalike, the other Charlie Callas, in his usual character becoming a hopeless stutterer. The one man Gerald meets the who believes him, who identifies himself as a FBI special agent, turns out to be an escapee from an insane asylum.The movie climaxes in a chase through Sea World San Diego, where Gerald is pursued by Thors gangsters, a rival group of gangsters who had made a deal with Syd to buy his diamonds, and a group of Chinese who smuggle the diamonds disguised as plastic pearls. Gerald disguises himself as a Kabuki dancer but is pursued until Suzie rescues him by flying by with a helicopter and dropping a rope ladder that Gerald escapes on. They return to the Pacific Ocean, where Syd reappears. The gangsters chase Syd into the ocean, and Gerald and Suzie walk away, deeply in love. The diamonds are never located. ........

Source: Wikipedia