The Walt Disney Co. (NYSE: DIS) has been one of the most prolific companies in Hollywood for many years, but its dominance has been growing lately as its movies across multiple genres have made billions of dollars at the box office. In 2016, it had by far the highest sales of any film studio, bringing in almost as much as the the next two -- Warner Bros., owned by Time Warner (NYSE: TWX), and Twenty-First Century Fox (NASDAQ: FOX)(NASDAQ: FOXA) -- combined. Yet, even with all of this massive success in recent years, especially with the well-performing relaunch of the Star Wars franchise, Disney's best-performing domestic hit of all time might be a surprise.