Moon director Duncan Jones will release his latest sci-fi thriller Source Code on April 1st. Apparently, Summit Entertainment is concerned that the paying public isn't up to speed on what this mash-up of Groundhog Day, Speed, and The Matrix actually is. To help get folks acquainted with the concept, which sees Jake Gyllenhaal jumping into the body of another man to save a commuter train from a bomb explosion, Summit has recruited Pee Wee Herman to explain the plot. They've also released the first five minutes of the movie to hopefully entice those still on the fence about attending the movie's opening weekend. You can check out the opening moments of Source Code, along with Pee Wee Herman and Jake Gyllenhaal, in the clips below.