This accent comes from Symphobia, ProjectSAM's orchestral sample library created for film, television and game composers who need cinematic hits. Stabs like this one are designed to be dropped into a score at a moment of tension, rather than played as part of a longer melody, which is why the short clip is so easy to reuse in edits, memes and reaction videos. It works in the same way as a dun dun sting for a sudden reveal, and it remains popular because an orchestral hit can instantly signal danger, surprise or importance without dialogue.