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Crustacés et coquillages is a fresh French comedy film with numerous surprise turnarounds and about the tolerance of a family of four. The family spend an idealistic summer vacation together where each of the family members gets involved in a new or old relationship.

Two couple of friends, one very rich, the other almost homeless, decide to go on Holiday. Julie, a single mother, joins them too. Once at seaside, it starts a complicate love cross among them that will involve also a transsexual, a jealous brother, a Latin Lover and another nervous stressed couple. Not to mention about the daughter of one of them that is secretly in Chicago with one of her father's employees... At the end of the summer, all of them will join the same party...

Jean-Étienne Fougerole is an intellectual bohemian who released his new novel "In Open Arms" and calling the wealthiest people to welcome home the families in need. While he promotes his book during a televised debate, his opponent criticized him for not applying what he himself advocates. While stuck, Jean-Étienne Fougerole accepts the challenge, for fear of being discredited. The same evening, a family of Roma rings the door of his Marnes-la-Coquette villa and the writer feels obliged to house them.

Lawyer Fan Kam-man believes that his wife Chun Yuen-yung perished in a plane crash three years ago and walks down the aisle again with Yan Bik-kei. In fact, Chun survived a crash-landing on a deserted island with fellow passenger Wong Ah-lik, a biologist. Returning to civilisation, Chun sabotages their wedding night at the hotel. Overjoyed with her safe return, Fan pulls off a feat with his mother and wife to terrify Yan into divorcing him. However the lie is exposed when Wong shows up. Unyielding, the women settle to serve as wives to the same man. Mistaking Fan for the person Chun is going to see, the eavesdropping Yan goes to the date in her stead and unwittingly sleeps with Wong. Yan finally settles for Wong, putting an end to the topsy-turvy.

In the countryside near Normandy's beaches lives Marie, unhappy. It's 1945, she's married to Jérôme, a somewhat fussy milquetoast, diffident to the war around him and unwilling to move his wife to Paris, where she longs to live, shop, and party. A German outfit is bivouacked at Jérôme and Marie's crumbling château because its commanding officer is pursuing Marie. She's also eyed by a French spy working with the Allies as they plan D-Day. He woos her (posing to the Germans as her brother) and, in his passion, forgets his mission. Heroics come from an unexpected direction, and Marie makes her choice.

Two buddy farmers are visited by aliens who like their domestic cabbage soup.

An American gets a ticket for an audience participation game in London, then gets involved in a case of mistaken identity. As an international plot unravels around him, he thinks it's all part of the act.

Danielle, a vibrant young woman is forced into servitude after the death of her father when she was a young girl. Danielle's stepmother Rodmilla is a heartless woman who forces Danielle to do the cooking and cleaning, while she tries to marry off the eldest of her two daughters to the prince. But Danielle's life takes a wonderful turn when, under the guise of a visiting royal, she meets the charming Prince Henry.

While visiting her sister in Paris, a young woman finds romance and learns her brother-in-law is a philanderer.

Jon and Garfield visit the United Kingdom, where a case of mistaken cat identity finds Garfield ruling over a castle. His reign is soon jeopardized by the nefarious Lord Dargis, who has designs on the estate.

A New York girl sets her father up with a beautiful woman in a shaky marriage while her half sister gets engaged.