I know it's nerdy to have a favorite etymology (emblem, which via the Greek ballein ("to throw") is related to parable, metabolism, problem, ballistic, and diabolic), but it's even nerdier to have a second-favorite one: foist.
An early sense of the word "foist," now obsolete, referred to palming a phony die and secretly introducing it into a game at an opportune time. The action involved in this cheating tactic reflects the etymology of "foist." The word is believed to derive from the obsolete Dutch verb "vuisten," meaning "to take into one's hand." "Vuisten" in turn comes from "vuyst," the Middle Dutch word for "fist" which itself is distantly related to the Old English ancestor of "fist." By the late 16th century "foist" was being used in English to mean "to insert surreptitiously," and it quickly acquired the meaning "to force another to accept by stealth or deceit."