Do you still think Pepsi made a huge mistake by taking Diet Crystal Pepsi off the market? Did you love McDonald’s Arch Deluxe, Frito-Lay Lemonade, Colgate Kitchen Entrees, and Watermelon Oreos? If so, you’re probably a “Harbinger of Failure” — a consumer whose taste is so unusual that companies can use your preferences to figure out what not to sell.