HARRY POTTER AND THE CHAMBER OF SECRETS (2002)
In the scene at the end of the film between Dumbledore, Harry and Lucius Malfoy, Malfoy says, "Let us hope that Mr. Potter will always be around to save the day." Harry's response, "Don't worry. I will be." was an ad-lib by 13-year-old Daniel Radcliffe. In later interviews Jason Isaacs (Malfoy) called the moment "electric."