Teacup to Rat

Teacup to Rat (incantation unknown) is a Transforming spell that turns teacups into rats.

Behind the scenes

 * Given the number of transfiguration lessons the card that this spell debuts on in the TCG requires in order for one to learn it (and the context it is mentioned in the Harry Potter and the Philosopher's Stone) this does not appear to be very advanced magic (probably Second or Third Year level).

Appearances

 * Harry Potter and the Philosopher's Stone
 * Harry Potter Trading Card Game