Take your favorite fragrance, for example. Did you know it comes in body wash form, even if you haven't seen it in one those 3-pc gift sets in the TJ Maxx checkout line? It does — it just has a different brand name — and combining the two is like giving a mouse a cookie. Because once you realize how good you smell, you're probably going to ask for corresponding laundry detergent, and then you're going to want a reed diffuser, then a car freshener...