Hansel and Gretel (breadcrumbs)
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A reference to the Brothers Grimm fairy tale in which Hansel leaves a trail of breadcrumbs to find his way home through the forest.
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Mentioned once in Four For The Seesaw.
Four For The Seesaw
Season 4 · Episode 13 · S04E13
“Perhaps you should have left a trail of breadcrumbs before you started down that toast!”