Batman can inspire you to be a better person. The appearance of the Dark Knight on the Milan metro system had a remarkable impact on the usually grumpy commuters.

The testy travellers suddenly became more altruistic. When a pregnant woman boarded the train, people were far more likely to give up their seats when Gotham's finest was keeping a watchful eye nearby.

A study by psychologists from Università Cattolica del Sacro Cuore found that the mere presence of a man dressed as The Caped Crusader increased altruism by two-thirds.

• Kelvin Fletcher issues update on devastating injury as farm thrown into chaos
• Laughs as Nigel Farage torn apart by Rachel Reeves with brutal insult in Budget speech

The research links to theories of behavioural disruption, where novelty or surprise forces the brain to reassess its surroundings. Typically, we go through our days on autopilot, guided by social scripts and mental shortcuts. When something odd - like, say, Batman - appears, those scripts are interrupted.

Prof Francesco Pagnini, lead author of the study, said: “The sudden appearance of something unexpected - Batman - disrupts the predictability of everyday life and forces people to be present, breaking free from autopilot.”

Everest dwarfed by new discovery, physicists create a 'time crystal' and where the devil is Atlantis? All this and more in our weird science newsletter

The study saw psychologists from Università Cattolica del Sacro Cuore stage 138 real-world rides on the Milan Metro, where an experimenter pretending to be pregnant boarded a crowded carriage. In the control scenario, it was business as usual: only a third of travellers offered their seat. But when a man dressed as the Dark Knight slipped on at a different door, altruism soared to two-thirds.

In a twist worthy of Gotham itself, among those who stood up, nearly half later said they hadn’t even clocked The Caped Crusader. Researchers have dubbed this the “Batman effect” - a brief jolt that snaps people out of commuter trances and into the here-and-now, where they actually notice someone wobbly, pregnant, or plainly in need.

“The superhero figure enhanced the relevance of cultural values, gender roles, and norms of chivalrous help,” Prof Pagnini said, but classic social priming doesn’t fully explain it, especially when many helpers didn’t consciously see Batman at all.

Instead, it’s a case of breaking the script. Most of us drift through public spaces on autopilot, guided by unspoken rules and routine. Throw in something delightfully offbeat - a bat-eared commuter, a burst of street theatre, a bit of public art - and those mental shortcuts stall. People re-engage, scan the carriage, and suddenly spot what matters: someone who could do with a seat.

The researchers even suggest the effect may ripple. A handful of passengers become more alert; others catch the vibe; kindness spreads. In their words, “unexpected events can increase prosocial behaviour by momentarily disrupting automatic attention patterns and fostering situational awareness.”