This accent comes from Symphobia, a cinematic orchestral sample library created for film, television and game composers who need ready-made dramatic ensemble hits. Editors and sound designers later pulled short stabs like this one out of that scoring context and reused them as standalone effects for online video, where a two-second orchestral hit can sell a reveal without a full score. It works in the same tradition as the classic dun dun dun moment, and it remains popular because it instantly signals tension, importance or an unexpected turn.