RoboCop
At times, directors feel it’s best to withhold some information from the rest of the cast so that they can capture the most genuine reactions. Thus was the case when Kurtwood Smith told director Paul Verhoeven about improvising a line. Both Smith and his director chose to surprise the cast during the scene where Clarence Boddicker (Kurtwood Smith) was taken by the police after RoboCop beat Boddicker. So when Kurtwood Smith shouts out, “Give me my f***in’ phone call,” the entire cast was actually in shock.

RoboCop
A Clockwork Orange
Even outstanding and experienced directors like Stanley Kubrick can hit a brick wall sometimes. Well this happened while filming the scene in A Clockwork Orange where Alex (Malcolm McDowell) and his friends break into a woman’s home and attack her. Kubrick didn’t love how the scene was coming out, take after take. Thus, he told McDowell, “Just do whatever you want.” That’s when McDowell broke out into the famous, “Singing in the Rain.”

A Clockwork Orange