The Reader's Digest version is someone once deeply involved with the TFN website claimed to have a lot of insider plot spoiler info. They claimed Yoda acts "crazy" kind of like he does when we first saw him in Empire to escape capture. Part of this deception involves breaking wind.

Needless to say, the lie got bigger and imploded. I tried looking for the thread on their forum couple years back.

http://boards.theforce.net/Revenge_of_the_Sith_(Spoilers_Allowed)/b10331/17297520/?190

There is a huge four month gap in posts on page 138 around the time this all went down. Make of that what you will.