The line comes from Harry Potter and the Philosopher's Stone, released in 2001, during Professor Flitwick's Charms class where students learn Wingardium Leviosa. Emma Watson as Hermione corrects Rupert Grint as Ron, turning a small pronunciation lesson into one of the film's most quoted moments. Clips of the exchange spread widely on YouTube and TikTok as a reaction sound, and the contrast between her confidence and his frustration keeps it useful for any modern mispronunciation joke.