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Answers: It stars the two actors and it is set on a cruise ship. Jack Lemmon gets the cruise by working on it?! Sound familiar?

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OUT TO SEA - 1997. Charlie (Walter Matthau) is a con artist who talks his widowed brother-in-law, Herb (Jack Lemmon) to go on a cruise to meet lonely widows. Charlies doesn't tell Herb that they will be working as dance hosts and posing as wealthy bachelors.

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The Odd Couple Take a Cruise

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It's called "Out to Sea"

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