The Oswald cartoon “Oh, Teacher” (1927) is mainly about a cat trying to take Oswald’s girl away from him. But the plot’s interrupted by a scene of a piglet being picked up for school. His mother leaves him on a hook! Then a mechanical hand from the school bus grabs him.
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Somehow, Walt Disney didn’t fit in an udder joke (there’s no cow in this one), but there is an outhouse joke.
This is a reference to classic railway mail transportation, where they would use a hook hanging outside the 'RPO' car to pickup mailbags 'On the fly'. A dated concept, to be sure.
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