In one of the most famous cases of actors turning down roles, Will Smith did just that for the role of Neo in The Matrix. The role instead went to Keanu Reeves and Will Smith went onto do Wild Wild West.
But let's put on our alternate reality googles and see what The Matrix would've looked like had Will Smith accepted the role of Neo :)
And here's where you can follow me!
Patreon (for Reviews): http://www.patreon.com/TheUnusualSuspect
Patreon (for Mashups): https://www.patreon.com/UnusualSuspectMashups
Unusual Suspect SubReddit: https://www.reddit.com/r/TheUnusualSuspect