Lacarnum Inflamari is the incantation of a charm used to ignite the cloak of a witch or warlock by shooting a fireball from the tip of the caster's wand. Hermione Granger was known to be proficient in the performing of this spell, using it in September of 1991 on her Potions Master, Professor Severus Snape, at a Quidditch game when she believed him to be jinxing her friend Harry Potter's broomstick.