Working Girl (1988)
Starring Melanie Griffith, Harrison Ford, Sigourney Weaver, Alec Baldwin, Joan Cusack, Philip Bosco, Nora Dunn, Oliver Platt, James Lally, Kevin Spacey, Robert Easton, Olympia Dukakis, Amy Aquino, Jeffrey Nordling, Elizabeth Whitcraft, Maggie Wagner, Lou DiMaggio, David Duchovny, Georgienne Millen, Caroline Aaron, Nancy Giles, Judy Milstein, Nicole Chevance, Kathleen Gray, Jane B. Harris, Sondra Hollander, Samantha Shane, Julia Silverman, Jim Babchak, Zach Grenier, Ralph Byers, Leslie Ayvazian, Steve Cody, Paige Matthews, Lee Dalton, Barbara Garrick, Madolin B. Archer, Etain O'Malley, Ricki Lake, Marceline Hugot, Tom Rooney, Peter Duchin, Maeve McGuire, Timothy Carhart, Lloyd Lindsay Young, F.X. Vitolo, Lily Froehlich, Michael Haley, Mario T. DeFelice Jr., Anthony Mancini Jr., Suzanne Shepherd, Trish Cook, Priscilla Cory, Marilyn Dobrin, Kevin Fennessy, Anita Finlay, Tom Sean Foley, George Gerard, Daniel Henning, Eric Kramer, Alison Wachtler, Matthew Bennett
When a secretary's idea is stolen by her boss, she takes a risky chance to reclaim it by impersonating him and running the project from his position.