Okay so first to prepare run for awhile around your neighborhood just to get fit and ready. then, go to Victoria's secret and buy a huge bra or a thong. your choice. and then buy Justin Bieber tickets or sneak in through the back with your 'connections' and then when you are in audience throw the bra or thong on stage at him and while he is distracted run on stage use your video taker and take video of him with you in it. But it will have to be short. you may just want to take a picture because security will be on you faster then you can say Mrs. Bieber. OR you could go the legal way and just get meet and greet.