I read a news story just the other day about a self-declared “grammar vigilante” who reportedly prowls the streets of Bristol, in south-west England, correcting errant punctuation on business signs. Apparently for the past decade or so he has been venturing out late at night, wearing a coat and black hat, to surreptitiously correct sloppy grammar on many of the city’s billboards. Carrying an eight-foot-long tool he refers to as an “apostophiser,” which allows him to correct punctuation marks on elevated signs, he has rectified scores of signs, including such public abominations as “Potato’s for sale”, “Amy’s Nail’s, and Cambridge Motor’s.”