A Grow-Your-Own-Warts kit is used to grow warts on a person's body. Harry Potter got one of these in a Christmas cracker during his first year at Hogwarts, but there is no evidence that he ever used it.
A Grow-Your-Own-Warts kit is used to grow warts on a person's body. Harry Potter got one of these in a Christmas cracker during his first year at Hogwarts, but there is no evidence that he ever used it.