The clip was discovered by Connor 'Turpy' Toorish several months back, a lot of people have been doing it unintentionally, although obviously someone else out there will know about it.

He gave me permission to release the details today, having kept them quiet until the demise of CoD2

The game is already plagued with vertical clipping, sliding and rate hacking, although some speculate that vertical clipping won't be an issue once you can wallbang CoD4

Check out the below video

http://youtube.com/watch?v=AUifQwU8kXI