Caillou is a Canadian animated children's series that aired from 1997, featuring a bald four-year-old known for whining. In the 2010s, GoAnimate creators built a huge meme subculture of grounded videos where Caillou cries after being punished, and his synthetic tantrum wail became a recognisable meme sound on its own. Today it circulates on meme soundboards as a shorthand for an absurd, childish overreaction, sitting alongside other cartoon reaction clips like the baby laughing meme that creators pair with it for comedic contrast.