An interesting social paradox plays out every morning around the world as millions of people board commuter trains and buses: Human beings are one of the most social species on the planet, yet when in close proximity with one another -- sitting inches away on a train -- we routinely ignore each other. Why can such social agents be so antisocial? Participants in recent experiments not only underestimated others' interest in connecting, but also reported positive experiences by both being spoken to and to speaking with a stranger.