When Janet Flock opened the Candle Light Booksellers in the early 80's, she hung an old hunting rifle on a plaque behind the register, clearly marked "Chekov's Gun".
She was delighted when people understood the reference, but if anyone asked she would always say that it was to discourage shop lifting with a broad smile and a wink. On other occasions she would tell people that she got conned, because it was Sulu who collected antique weapons on Star Trek, not Chekov.