Moviegoers at the Regal Cinema in King of Prussia got the surprise of their lives when actor Brad Pitt decided to join them for a showing of his new movie -- "World War Z."

Pitt just waltzed in to the theater Thursday and thanked his fans for coming to watch his zombie flick.

Pitt, who has been showing up to screenings in several cities, joked with the crowd that there was a "Spoiler alert: It doesn't go well" for the city in the zombie disaster flick.

The movie, which was shot in Scotland but is set in Philadelphia, will have a wide release on June 21.

Whether Brad Pitt will show up to share your popcorn with you is anyone's guess.