All of Me (1984)

Director: Carl Reiner
Cast: Dana Elcar, Jason Bernard, Lily Tomlin, Madolyn Smith Osborne, Richard Libertini, Selma Diamond, Steve Martin, Victoria Tennant

Synopsis:

Just before stubborn millionaire Edwina Cutwater dies, she asks her uptight lawyer, Roger Cobb, to amend her will so that her soul will pass to the young, vibrant Terry Hoskins but the spiritual transference goes awry. Edwina enters Roger’s body instead, forcing him to battle Edwina for control of his own being.