Aggression among captive killer whales is common. They attack each other and their trainers as well. In 2013, SeaWorld's treatment of killer whales in captivity was the basis of the movie "Blackfish", which documents the history of Tilikum, a killer whale at SeaWorld Orlando, who had been involved in the deaths of three people. The film led to proposals by some lawmakers to ban captivity of cetaceans, and lead SeaWorld to announce in 2016 that it would phase out its killer whale program after various unsuccessful attempts to restore its revenues, reputation, and stock price.