Full Metal Jacket
Here’s another Kubrick entry to the list. He wrote the original screenplay for Full Metal Jacket but the casting of R. Lee Ermey took it to new directions. The actor was actually in the Marine corps for quite some time, so we can assume that he knew what he was doing. After the release of Full Metal Jacket, Kubrick would admit that around half of Ermey’s lines were improvised!
Saving Private Ryan
Since we’ve started talking about World War II films, how can we go without mentioning Saving Private Ryan? Think back to the scene when Tom Hanks and Matt Damon were discussing things left behind. The latter even begins talking about his brother kissing a girl— that part was completely off the cuff!