Iconic Movie Scenes That Were Never Supposed To Happen

It's easy to imagine that every single detail of a classic movie was put into the script by the screenwriter, but some of the most iconic moments in cinema weren't actually supposed to happen at all. On occasion, actors have improvised lines, actions, or even entire monologues that were so brilliant that they ended up being kept in the film, oftentimes becoming one of their respective film's most famous scenes.