The line comes from the asdfmovie animated sketch series created by TomSka on YouTube, where the I Like Trains kid says it in a flat voice before a train suddenly runs over someone. The sketch became one of the series most quoted moments and inspired songs, remixes and countless fan voice impressions. This page hosts an unfiltered fan recording of that delivery rather than the cartoon audio. Online, the clip keeps circulating because the setup is instantly recognisable and the payoff is always the same simple train gag.