A Clockwork Orange
We are sure you remember the “Singing in the Rain” bit in A Clockwork Orange. Apparently, Stanley Kubrick could not get the scene right so he eventually resigned and told the actors to do whatever they wanted. Malcolm McDowell started singing the song and that was all the inspiration Kubrick needed.
Full Metal Jacket
Another Kubrick masterpiece on our list is Full Metal Jacket. Even though he penned the screenplay, he was open to suggestions. Apparently, this was especially true for the drill sergeant’s lines. Actor R. Lee Ermey was once a military drill instructor so he probably knew how to make it more realistic.