This quote comes from Harry Potter and the Philosopher's Stone, released in 2001, during the Hogwarts levitation lesson where Hermione corrects Ron Weasley. The scene became one of the most repeated lines from the film series because the delivery is so recognizable and easy to reuse as a reaction. Online, creators use it whenever someone says a name, term, or phrase the wrong way, much like a verbal version of a dramatic reaction sound such as vine boom.