You're a Lizard, Gary

Gary Plotter was the worst wizard at Pigzits magic school. Gary found an ancient spell that was supposed to turn him into a great wizard. Unfortunately, unknown to him, the ancient scribe had messed up and written the wrong word on the scroll by accident. Gary called out "Convertimini ad me lacertae magnae" which instantly turned him into a great lizard. If he had paid attention in classes, Gary would have known the correct word was Veneficus meaning wizard, not Lacertae, meaning lizard. "You're a lizard, Gary"