Why this word is great
MARPLOT — [Adjective, Noun] A person or force that interferes with or ruins others' plans or enjoyment; from mar ("to spoil, to ruin") + plot ("plan"), first recorded as a character name in Susanna Centlivre's play 'The Busie Body' (1709). Unlike a busybody (who meddles indiscriminately) or a spoilsport (who merely deflates joy), a marplot is a saboteur of intention—the friend who blurts out a surprise party a day early, the colleague who "helpfully" corrects your pitch mid-meeting, or the bureaucratic footnote that derails a decade of research. They are the human equivalent of a dropped stitch, proof that the universe conspires not just through chaos, but through the misplaced enthusiasm of those who cannot bear to let a thing unfold.