The April Fools
movie

He has a wife. She has a husband. With so much in common they just have to fall in love.
Released May 28, 1969
Overview
Newly-promoted if none too happily married Howard Brubaker leaves a rowdy company party early with the stunning Catherine, whom it turns out is herself unhappily married — to the boss. They spend an innocent night in New York becoming more and more attracted to each other, so that when Catherine announces she intends to leave her husband and return to Paris, Howard asks to go along too.
Cast

Jack Lemmon
as
Howard Brubaker

Catherine Deneuve
as
Catherine Gunther

Peter Lawford
as
Ted Gunther

Jack Weston
as
Potter Shrader

Myrna Loy
as
Grace Greenlaw

Charles Boyer
as
Andre Greenlaw

Kenneth Mars
as
Les Hopkins

Melinda Dillon
as
Leslie Hopkins

Harvey Korman
as
Matt Benson

Sally Kellerman
as
Phyllis Brubaker
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Gary Dubin
as
Stanley Brubaker
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Janice Carroll
as
Mimsy Shrader
Crew

Stuart Rosenberg
as
Director
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Michel Hugo
as
Director of Photography

Lynn Stalmaster
as
Casting

Gordon Carroll
as
Producer
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Hal Dresner
as
Writer
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Richard Sylbert
as
Production Design
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Bob Wyman
as
Editor

Donfeld
as
Costume Design
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Roger Shearman Jr.
as
Camera Operator
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Ted Zachary
as
Assistant Director
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Clay Lambert
as
Makeup Artist
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Hank Moonjean
as
Assistant Director