It was a repeat of an incident in 1985 when, after a Hanshin Tigers triumph, a life-sized model of Colonel Sanders was stolen and thrown into the Dotonbori River.
The Colonel was replaced by Japan fans yesterday, with 500 hurling themselves into the river in joy, despite the presence of 400 police officers detailed to stop them.
Two fans who jumped in were arrested for exposing themselves, and the wild scenes ensued despite signs in six languages warning about the dangers of such celebrations.
"It's just great. I just want to burst with joy," said 16-year-old Osaka resident Yuya Yamamoto of Japan's latest triumph.
Japan's advance into the later stages of the competition has a more sinister side, with supporters so desperate for tickets that theft is on the increase.
A 19-year-old woman had a ticket for Japan's game with Belgium stolen when she was asked to produce it, and another man had his ticket robbed when he stopped at a vending machine.
The authorities took a compassionate line, allowing both fans into the Osaka stadium when they explained what had happened.