The McDonald’s ice cream machine isn’t broken. It’s locked.
Images: P1898 (CC BY); Sumstar-icecreammachine; Mushushu; Softeis-Maschine Rainbow licensor per its File page; © Raimond Spekking / CC BY-SA 4.0 (via Wikimedia Commons); Famartin (CC BY-SA 4.0); Highsmith Archive / Library of Congress. Plate texts per the dossier (WIRED; NRN; §1201 rule).
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Thanks for this info. I'll sleep better tonight.