I've had this pet peeve for a while, but since working at Body Shop, it's come to a head. It bugs me when people ask if I have soap in a certain flavour. Are you going to eat the soap? Rip of the plastic and take a nice big bite of Satsuma? Doubtful.
They should be saying they want the soap in a certain scent. I've given up correcting customers, because it literally happens on a daily basis, but I do correct my co-workers from time to time.