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Dumbo: A Lesson in Being Prepared is a 1981 Disney educational live-action/animated short, part of the Disney's Animated Classics: Lessons in Living series. The short features clips from Dumbo.
Timothy Mouse pricks Dumbo with a pin to make him perform despite the fact that Dumbo feels uncertain about his act, and the result is a crashing failure. The sequence makes a point of over-eager youngsters who try things before they are prepared.