SAY IT ISN'T SO puts a comically depraved spin on a classic love story: Boy (Klein) meets girl (Graham); boy falls in love (and has 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.
