The clip comes from Greta Thunberg's speech at the UN Climate Action Summit in 2019, where her 'How dare you' line became the most quoted part online. It spread quickly through reaction videos, GIF captions, and short meme edits because the delivery is so direct and intense. People still use it when they want a dramatic callout sound that instantly signals outrage, especially in clips built around an exposed contradiction or an over-the-top moral reaction.