This stone, in particular, was the Carnal Random Stone, which twisted wishes to become sexual or even erotic, while also granting the wish to a random person within 50 feet of the wisher, but not the wisher himself (or herself).
For example, if Karyn simply wished to wear a dress, someone within 50 feet of her would find himself (or herself) in one of the most erotic dresses around "“ and if that person didn't hear the wish, they would believe this type of clothing to be completely normal for them.