I is for Ifkovic: Do you know what an "earworm" is? It's a tune that gets stuck in your head and keeps on going like the Energizer Bunny. (Worms, bunnies, mixed metaphors?) Earworms have found multiple niches in cemetery ecosystems. One niche is marked by headstones with lighthouses on them: "Brightly beams our Father's mercy from his lighthouse evermore, but to us he gives the keeping of the lights along the shore." That's the Phillip Bliss Earworm. St. Agnes Cemetery.