Shampoo and conditioner are usually meant to go together, but there's no law that says it has to happen that way. Some people refuse to use miss-matching shampoo and conditioners, while others show a rebellious streak by using shampoo A but conditioner B. It probably happens more with haircare products than any other, since we tend to use them in conjunction. So what camp are you in? Do you match your shampoo and conditioner?