Eye of rabbit, harp string hum, turn this water into rum was supposedly the incantation of a transfiguration spell that turned water into rum. Its authenticity was dubious, as it had only been known to either create a weak tea, or an explosion.
Seamus Finnigan tried to cast it in 1991, and in his first attempt, he managed to make a "weak tea," before causing an explosion. The next day, he tried again several times, but only caused another explosion, creating smoke and blackening his face.
Behind the scenes
- It is unknown if this is a real spell or not, or simply a case of bangs-and-smells magic, although given that Seamus could turn the water into a weak tea, it is possible that it is, although he could not perform it correctly. Alternatively, it is not a real spell, and the turning of the water into a weak tea was purely accidental.
- Harry Potter and the Philosopher's Stone (film) (First appearance)