Have you ever gone to pick up shampoo and accidently come home with conditioner? I think I did that about 5 times in a row trying to buy shampoo.
YES! So I make it a point to read the bottle both when I pick it up AND when I go to pay for it to make sure. Luckily for me my preferred brand looks different whether its shampoo or conditioner (I've been using the exact same brand & scent shampoo for several years now...).