Famous Movie Lines That Were Actually Improvised
A Clockwork Orange
Stanley Kubrick was often very meticulous as a director, but he was also very insightful and knew how to get a great performance out of his actors.
Throughout A Clockwork Orange, all kinds of retakes, method acting, and mind games were used.

A Clockwork Orange
But one scene trumped them all, as Kubrick was unpleased with a key scene where Malcolm McDowell and accomplices conduct a home invasion. He told McDowell to do whatever he wanted, and McDowell famously chose to belt out “Singing in the Rain.”