Say It Isn't So (2001)
"They share a love. They share a passion. And they might share DNA."
Comedy
Romance
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Boy meets girl; boy falls in love (and had wild, non-stop sex) with girl; boy loses girl... when they discover they are brother and sister! But when he learns that he's the victim of the ultimate case of mistaken identity, the lovesick young man -- whom everyone still thinks is after some taboo thrills -- must race across the country to stop her from marrying another man.
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Cast
Chris Klein
Gilbert Noble
Heather Graham
Josephine Wingfield
Orlando Jones
Dig McCaffrey
Sally Field
Valdine Wingfield
Richard Jenkins
Walter Wingfield
John Rothman
Larry Falwell
Jack Plotnick
Leon Pitofsky
Eddie Cibrian
Jack Mitchelson
Mark Pellegrino
Jimmy Mitchelson
Brent Hinkley
Streak
Henry Cho
Freddy
Richard Riehle
Sheriff Merle Hobbs
Brent Briscoe
Detective Vic Vetter
Ezra Buzzington
Stewart
Julie White
Ruthie Falwell