Choo Choo Charles is a 2022 indie horror game from Two Star Games in which players explore an island while being hunted by Charles, a demonic train with spider legs. Its chugging became familiar through gameplay videos, streams and short-form edits, where the contrast between a cheerful train sound and a terrifying predator made it instantly memeable. It is still used because the game remains a recognisable horror reference, and the rhythmic chugging alone is enough to tell viewers that something large, strange and dangerous is coming.