Giggles
During filming of the final film, featuring the ever famous kissing scene between the horcrux versions of Harry and Hermione, Rupert Grint had to be removed from the set for laughing too much. Way to go, Ron.
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Good One, Draco
Tom Felton, the actor who portrayed Draco, first auditioned for the roles of Harry Potter and Ron Weasley, but was instead chosen to play Draco Malfoy. Smart choice.