"Yorokobe, shounen" is a well-known quote from the Fate franchise, commonly associated with Kotomine Kirei. The line became especially popular through anime clips, reposts and reaction edits shared across YouTube, TikTok and anime meme pages. Fans use it because the delivery is instantly recognizable and captures Kirei’s cold, satisfied presence in only a few words. It remains common in anime meme culture for scenes involving manipulation, grim humor, betrayals and ominous foreshadowing.