'Twilight' without Kristen Stewart? No Brangelina without 'Mr. and Mrs. Smith'? 'Friends' without Jennifer Aniston? 'Titanic' without Leonardo DiCaprio? It could have been. With one decision from the casting directors, one suggestion from a co-star or a gut reaction from a director, our favorite movies and TV shows could have wound up completely different. Take a look at some of the decisions that changed the face of Hollywood. Want more fateful decisions? Check out 'The Box' with Cameron Diaz opening today. Get Tix >>>