ONE PIECE Volume 4 "Mikazuki"

The butler of the mansion in Syrup Village, Crahador, was actually Captain Kuro, the first captain of the Kuroneko Pirates. Usopp learns that he is leading a gang of pirates to raid the village.

He tells the truth to Kaya, the daughter of the mansion, but he doesn't believe her at all. So Usopp decides to take it upon himself to meet Captain Kuro and the others on the beach. If they succeed, the villagers will be able to live their usual peaceful day without knowing anything.

In other words, Usopp dared to choose to be called a liar.