They say that surprising people may make them more aware of their surroundings so politeness kicks in. Or that we need more billionaire vigilantes to ride the subway.
"...this study highlights how situational disruptions alone may be sufficient to produce similar effects. This suggests a potential mechanism by which novelty and unpredictability foster prosocial behavior, reinforcing theories that link attentional shifts to increased social responsiveness. At the same time, alternative explanations should be considered. For instance, the superhero figure may have increased the salience of cultural values, gender roles, and chivalrous helping norms.... More studies are warranted to better understand the mechanisms underlying these effects and to disentangle whether they are driven primarily by attentional shifts, priming, or other contextual processes."