Biggest opening weekends for movies

POSTED: 1:45 PM May 07 2012   UPDATED: 7:23 AM 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.