A recent field study on the Milan metro revealed that passengers were significantly more likely to give up their seats to a pregnant woman when an individual dressed as Batman boarded the train. The unexpected presence of the costumed individual disrupted normal routines and increased the overall rate of seat-yielding from roughly 38 percent to over 67 percent. Surprisingly, nearly half of the passengers who offered their seats reported not even seeing Batman, suggesting that unexpected events can subconsciously promote prosocial behavior.