A few interesting roles that never happened
-Mick Jagger wanted to play Dr Frank'Furter in "Rocky Horror"
-Not mentioned on the site, but Ken Russell wanted Jagger to play the Cardinel for "The Devils". Also, according to the site, Barbara Streisand turned down a role for the movie, and the idea of her in a movie with topless nuns writhing around in ecstasy is something else.
-John Denver was offered the lead role for "An Officer and a Gentleman", but he didn't like the script.
-Not casting, but George Lucas considered directing "Apocalypse Now"