Boris is the father figure in the fan-made Caillou grounded videos made with GoAnimate, later known as Vyond, where Caillou misbehaves and faces exaggerated punishments from his parents. The short scream comes from that world of loud, over-the-top parenting reactions, and it was clipped and shared on soundboards and in meme edits as the series spread online. It remains popular because the sound is instantly recognisable to viewers who grew up with those videos, and because a single panicked yell can stand in for shock, regret or getting caught.