The line comes from Hellsing Ultimate Abridged, the fan-made parody series in which Takahata101 voices the vampire Alucard with a deliberately over-the-top, theatrical delivery. This particular clip is a fan reading of that line rather than audio taken directly from the show, and it circulated on soundboards where short anime jokes are collected for reuse. Its appeal comes from that clash between serious villain delivery and a ridiculous punchline, which keeps it useful for reaction edits and anime humour long after viewers first heard the original joke.