After boarding the underground train on the U6 line in the north of the city, the man aggressively demanded that the 25-year-old woman give up her seat, police report.
While doing so, he told her that he was a police officer and then showed her a pistol that he had in his shopping bag.
Even this drastic strategy appears to have failed. Police report that the man changed into a different carriage before being arrested.
Police took down his name and confiscated the gun, which turned out to be a blank-firing gun. He is now being arrested for falsely claiming he was a police officer and for breaking the law on weapon possession.