- Harry: "Ron, what's Seamus trying to do to that glass of water?"
- Ron: "Turn it to rum. Actually managed a weak tea yesterday, before--"
- — Ron and Harry[src]
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, although given that Seamus could turn the water into a weak tea it is likely that it is but he could not perform it correctly.
- Harry Potter and the Philosopher's Stone (film) (First appearance)