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The catchphrase "Timmy fell down a well", originating from the TV-show Lassie, is a common idiom in popular culture played for humorous effect, especially when deducing that fact from Lassie's barking.

But is there actually such an episode whereby someone deduces from Lassie's barking that Timmy is trapped in a well? If not, where did this come from? Why a well?