This line comes from Moriarty the Patriot, the anime and manga series that retells the Sherlock Holmes stories from the perspective of William James Moriarty and his brothers. Framed as a battle of wits rather than a simple crime story, the series made its cat-and-mouse exchanges between Moriarty and Holmes central to its appeal. Clips like this one spread through anime edits and short-form videos, where the polite but defiant challenge fits perfectly over escapes, reveals and clever reversals, keeping it popular with fans of mystery and anime villains.