Brad Pitt surprises Philadelphia fans

<div class="meta image-caption"><div class="origin-logo origin-image "><span></span></div><span class="caption-text">&#34;Brad Pitt stops by a special fan screening of #WorldWarZ in Philadelphia&#34;  - @WorldWarZ tweeted this photo of  Brad Pitt surprising fans at the screening of World War Z in King of Prussia on June 6, 2013. </span></div>
June 6, 2013 3:36:48 PM PDT