On a related note, for far longer than I'm proud of, I genuinely thought imbeciles were some kind of particularly stupid seal, that lived in the Imber, which was some estuary off Newfoundland or some such.
Always swimming into boats, eating...
My wife is the queen of misheard lyrics, so much so that the kids call her "mummy wrongwords". Her best one is mishearing "Big Mac, fries to go" in Pop Will Eat Itself's 'Def Con One" as "Big fat ricicle".