Spartacus
This epic saga, in which rebellious slave Spartacus (played by Kirk Douglas) leads a revolt against the Roman Empire, has become one of the most famous and controversial action pictures ever - strangely not because of the violence but because of fears that it had 'homosexual overtones'.

The original version included a scene where Laurence Olivier attempts to seduce Tony Curtis. When the Production Code Administration and the Legion of Decency both objected, the scene was cut. This scene was put back in for the 1991 restoration, but since the soundtrack had been lost and Olivier had died, Curtis and Anthony Hopkins had to dub in the dialogue.

A couple of other interesting points of trivia are that (1) the sound of the crowd cheering "Spartacus!" was recorded at a Spartans American Football game in the USA, rather than in Rome, and (2) that Kubrick spent a quarter of the entire Spartacus shoot directing a single battle sequence.