Brad Pitt promotes `World War Z` at CinemaCon

Los Angeles: Hollywood star Brad Pitt made a surprise entry into CinemaCon conference to promote his upcoming film ‘World War Z’. The 49-year-old actor revealed that he decided to be part of the `zombie` project for his children, reported Ace Showbiz. "Listen, five years ago, I knew absolutely nothing about a zombie. Today, I consider myself an expert. This whole thing started because I just wanted to do a film that my boys could see before they turned 18, one that they would like, anyways. And they love a zombie," said Pitt. The Golden Globe Award-winning actor said that he and the crew had to face some challenges before starting the production. "We were faced with two Herculean challenges: How do we keep the global, spectacular, dynamic scope of the book and how do we originate a genre that`s been done quite often and really, really well?" he added. ‘World War Z’ is directed by Marc Foster and penned by Matthew Michael Carnahan and J Michael Straczynski. The hits the theaters on June, 21. PTI