Cameron Diaz co-stars with real-life ex Justin Timberlake in 'Bad Teacher,' in theaters June 24, and the pair clearly had such a blast making the movie, it’s a wonder they made it through every scene!Watch the video outtakes as Cameron and Justin try to keep a straight face in several different takes – and who knew Cameron was a snorter? The star breaks down entirely during a scene in which she has to hold a corn dog with mustard… (ETonline.com)