Black Ops: Kino Der Toten wall glitch?

Yeahhhh I know what your talking about. Me and my friends did this when we played. The purpose of this is to get extra power ups and bonuses, or get them more often. you have to make sure you do this as soon as the game starts because if you do it after you kill a zombie, it wont work. So essentially this is kind of an easter egg. Hope this helped.