Halloween house decor has come a long way since my trick-or-treating days, when a jack-o-lantern on the porch, perhaps the odd jointed paper witch on the door (think Beistle), was it. Seems meager now, but the appearance at dusk of those candlelit faces flickering on every stoop was, for a five year old, a phenomenon to rival the rise of Brigadoon. Which, as it happens, was the name of the neighborhood in Lexington, Kentucky, where my brothers and I first went a-masking. Eventually, lighted blow-molds appeared, sometimes accompanying, sometimes replacing, the carved pumpkins. They were thought to be a bit tacky. Later, after my day, there might be strings of mini lights—not many; again, excess was frowned on. Haunts, meanwhile, were the purview of the Jaycees. The most you could expect in the way of scares while going door to door was a teenager of the household jumping from behind a bush. How things change. This year, I bought my first inflatables: an eight-f...