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.
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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