In Harry Potter and the Prisoner of Azkaban, Alan Rickman and Michael Gambon played a prank on Daniel Radcliffe during the scene where all the students sleep in the Great Hall by putting a fart ...

Harry Potter star Michael Gambon was known to be a bit less serious than his character Dumbledore. The actor’s habit of joking around on set once messed with the performance of his A-List co-star.