Who Was That Lady?  (1960, U.S.A.)

A saucy comedy of errors.

David Wilson is a professor whose wife Ann gets the wrong idea when she sees a grateful student kiss David. Ann is about to leave David, so David asks his friend, Michael, to help him get her back.  Michael comes up with a story that David is an FBI agent and that the girl is a Russian spy. However, their con reaches the point where an actual FBI agent starts following them, leading to a series of adventures where the lies get bigger and the laughs get larger.

Cast:  Tony Curtis, Janet Leigh, Dean Martin, Barbara Nichols, James Whitmore