Biggest opening weekends for movies

POSTED: 11:45 AM MDT May 07, 2012    UPDATED: 05:23 AM MDT May 06, 2013 
Iron Man 3

"Iron Man 3" took off with the second-biggest U.S. opening weekend ever, pulling in an estimated $175.3 million in ticket sales. Check out the 20 movies that have made the biggest splashes on their opening weekends, according to Box Office Mojo.