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Princess Bubblegum smiling menacingly dressed as a crowned reaper, wielding a curling scythe and holding a skull with suspicious nubs.

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A request for Princess Bubblegum in a Halloween costume.

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An additional two panels, the first of Princess Bubblegum extending the skull towards Finn and Jake for inspection as she says she made it of papier-mache.
In the second, Finn leans in towards Jake, asking if Princess Bubblegum knows that he's wearing a hat usually, to which Jake shrugs.