Article note: It's such a good (fictional) example.
It's also such a classic "almost no one checked the references, and the person who propagated it misunderstood what they read." scenario.
Zoë: You sanguine about the kinda reception we’re apt to receive on an Alliance ship, Captain? Mal: Absolutely. What’s “sanguine” mean? Zoë: Sanguine. Hopeful. Plus, point of interest, it also means “bloody”. Mal: Well, that pretty much covers all the options, don’t it?