16) Harry Potter and the Chamber of Secrets (2002)
Tom Felton, who played Draco Malfoy in the Harry Potter franchise, had a line in Chamber of Secrets that was ad-libbed that brought some comic relief to the pompous personality of the character.
When Goyle is unable to think of a fast retort to one of Draco's questions, Felton on the spot ad-libbed: "I didn't know you could read." This line is so characteristic of the character of Draco that it was kept in the final draft.
Daniel Radcliffe, the actor who played Harry, was shockingly surprised by the remark and so his reaction in the scene is also all the more effective. The humour of the situation was also added through quick thinking by Felton.
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Edited by Mudeet Arora