A Fish Called Wanda (1988)

An ambitious con artist (played by Jamie Lee Curtis) who uses every ounce of her sexual wiles to obtain a fortune in jewels stolen by her gangster lover Tom Georgeson. First, she romances Georgeson's dimwitted but deadly henchman Kevin Kline (who won an Academy Award for his performance). Then, to clear the path for her getaway with Kline, Jamie woos Georgeson's starched-shirt attorney, John Cleese -- and it's Cleese whom she genuinely falls in love with. Michael Palin, Cleese's former Monty Python cohort, plays a stuttering mob flunkey who continually messes up his one big assignment: killing a little old lady (it isn't that he has any qualms about knocking off the old dear; it's just that her pet dogs keep getting in the way).