Bob & Carol & Ted & Alice (1969)

Columbia Pictures

This grown-up exploration of the literally swingin’ ’60s finds the title characters (played by Robert Culp, Natalie Wood, Elliott Gould, and Dyan Cannon, respectively) exploring the ins and outs of matrimony.

After attending a very ’60s retreat, Bob and Carol open up their marriage, and soon encourage their more conservative friends to do the same. But the film ends with a nonverbal, open-to-interpretation conclusion to the tune of Burt Bacharach’s gorgeous “What the World Needs Now,” sweetly sung by Jackie DeShannon.

Bonus: Culp (above left, with Wood) wears a very 1960s outfit at one point that would later inspire costumes worn by Mike Myers in Austin Powers: International Man of Mystery and Rafal Zawierucha – playing Roman Polanski — in Quentin Tarantino’s Once Upon a Time in Hollywood.

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