The passage of the bulls under the fountain in Piazza del Commercio

It was believed that on particular nights, in the valley below the fountain in Piazza del Commercio, it was possible to admire the passage of some unleashed bulls. In the 1940s some boys from the town spent a couple of nights looking at the valley, but they saw nothing. Another variant of the story has it that instead of bulls one could observe the passage of galloping horses.