Caribbean Basterds.

Three young people - Roy, Linda and José - who become pirates because they end up involved in the drug traffic. Out of need and greed, they find themselves caught up in something much bigger than them. It all begins as a joke but gradually becomes a cruel and dangerous game all the way to the final catharsis. The three main characters, Roy, his sister Linda and her boyfriend José, start out as avengers but turn into merciless criminals in an endless series of holdups and brutal acts of violence.