The top 10 most pirated movies in the world are either fantastical, involve superheroes, or have some serious fight scenes ("The Hangover" might have all three).
According to data collected by TorrentFreak, tens of thousands of movies are pirated every day using either BitTorrents or some other type of file sharing.
Say what you will about people downloading pirated movies, but according to TorrentFreak's list of the top 10 pirated movies these downloaders seem to have strikingly similar taste to those who go to the box office. (See IMDb's list of top 10 box office grosses below).
A side-by-side comparison of both lists shows "Avatar" as No. 1 and a couple others appearing in both lists, including "The Dark Knight" and "Transformers." This infographic by Meoble shows the same--major box office success for almost all of the top 10 pirated movies (except for "Kick-Ass").
All-Time Box Office: World-wide (according to IMDb)
1. Avatar (2009) $2,781,505,847
2. Titanic (1997) $1,835,300,000
3. Harry Potter and the Deathly Hallows: Part 2 (2011) $1,327,655,619
4. The Lord of the Rings: The Return of the King (2003) $1,119,102,868
5. Transformers: Dark of the Moon (2011) $1,114,558,779
6. Pirates of the Caribbean: Dead Man's Chest (2006) $1,065,896,541
7. Toy Story 3 (2010) $1,062,984,497
8. Pirates of the Caribbean: On Stranger Tides (2011) $1,041,963,875
9. Alice in Wonderland (2010) $1,023,285,206
10. The Dark Knight (2008) $1,001,921,825