Abilene Paradox - Not really a movie, but rather a business film; however, it is a classic in teaching "groupthink".
Amistad - The power of storytelling and influence against impossible odds (recommended by Annette Simmons).
Apollo 13 - Examples of leadership, teamwork, innovation, mission, passion, courage...
Breakfast Club - Abandoning prejudices. The movie deals with such fundamentals as the human tendency toward bias and hurting the weak.
The Bridge On the River Kwai- Leadership and corporate mission (Doing Things Right verses Doing the Right Things).
Crimson Tide - A lesson in lile that there are times when there is no easy way to tell right from wrong (things are not always black and white, but can be rather grey
Fantasia - Background themes for creative thinking. Also Big, with Tom Hanks, shows creativity in action.
Thelma and Louise - Cultural examination regarding the status of women (diversity).
12 Angry Men - developmental stages of groups, diversity in groups,
leadership, groups vs. teams.
The Wizard of Oz - Dorothy shows leadership as she takes a guy with no brains, one with no heart and one with no courage and melds them into an effective team that successfully accomplishes its mission. The team succeeds only after they stop blaming others for their problems, and start taking responsibility for their own destinies.