The
spell that Seamus Finnigan uses to try and
turn his goblet of water into
rum. Much like everything else that he tries to put spells on, the water explodes in his face.
Seamus: Eye of
rabbit, harp string hum, turn this water into rum!
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--
BOOM