What do you get when you cross Justin Bieber with Johnny Knoxville? Probably something like the new trailer for the Biebs’ concert biopic Justin Bieber: Never Say Never, which bookends its home-movie footage and Usher testimonials with shots of the mischievous Bieber sticking his finger at the 3-D camera and blasting it with Silly String. Finally, teenage girls all across America will know what it’s like to be visually assaulted by the AMA-laden prankster! The Never Say Never trailer even comes with special bonus footage, a post-credits coda where the Biebs is introduced to the 3-D camera for the first time: “Whoa, you can see it. Whoa.†Indeed. [PopEater]