You don't walk under a ladder, you don't break a mirror, and you sure don't walk on a grave — not because anybody explained why, but because Grandma said so. This week we get into Appalachian superstitions: death coming in threes, black cats, cows lying down before a rain, holding your breath past the graveyard, and eating turnip greens for money on New Year's (still hasn't worked). We don't believe any of it. We just aren't going to test it either.