The 2009 3D blockbuster Avatar ranks No. 1 on the list of most pirated movies, reports MovieFone via TorrentFreak. Despite director James Cameron's prediction that 3D would discourage illegal copies, pirates still downloaded Avatar 21 million times. (It's still the highest-grossing movie of all time.) Runners-up for most pirated include the Dark Knight and Transformers, each with 19 million downloads, followed by Inception (18 million) and the Hangover (17 million). Full list here.