http://www.youtube.com/watch?feature=player_embedded&v=vUXCXCKbXb8 This one doesn't have as happy of an ending. Tom Selleck's screentest to be Indiana Jones in Raiders of the Lost Ark was so good that he was offered the role of the man who would become film history's most famous archaeologist. Tom Selleck was Indiana Jones! Perhaps even sadder than missing out on the role because simply someone else was cast instead of you, Tom Selleck missed out on the role because he decided to become Magnum P.I. instead. Magnum P.I. certainly was a huge hit for Tom Selleck, as the TV show ran for eight seasons and over 150 episodes, so you can't say that it was a career ending mistake, but it did turn out that Tom Selleck really didn't have to choose one over the other. As if some great cosmic joke, Selleck's schedule opened up when there was a six month writer's strike in Hollywood that delayed the filming of Magnum P.I. During those six months, Harrison Ford had stepped in, the movie had been filmed, and a billion dollar francise was born.