Subway surfing is the act of riding on top of subway trains while they are in motion. It is a dangerous and illegal activity that has been ongoing since the New York City subway system opened in 1904. Recently, subway surfing has become a disturbing trend among young men and teenage boys who often post videos of their stunts online. The rise in popularity of subway surfing has led to an increase in accidental deaths and injuries. Officials in New York City have repeatedly asked social media companies to take down videos of the stunts to discourage future incidents. Those caught subway surfing by the NYPD are usually charged with reckless endangerment. Subway surfing is also the name of an endless runner mobile game developed by Kiloo and SYBO Games. In the game, players take the role of young graffiti artists who run through the railroad tracks to escape from the inspector and his dog.