Good Evening, Love (1972)

The movie version of Endre Fejes' short story is based on a case that happened in the early 1960s. A psychopathic working-class boy changes his identity for a few days on his hard-earned money. He pretends to be a Greek diplomat, pays for luxurious dinners, courts elegant women, and of course, always disappears before the engagement. But he falls in love with the beautiful Zsuzsa Christmas and can't leave her in time.