The line comes from Thomas, Percy and the Coal, the first episode of the second series of Thomas the Tank Engine, where the narration follows Thomas and Percy during a story about coal. Taken out of its gentle children's story context, the simple statement about leaving gained a second life online as a deadpan reaction clip. Creators reuse it because its calm, storybook tone makes an ordinary exit feel deliberate and final, especially when it is placed over modern footage of people, games or arguments ending abruptly.