Keep a "poker face" and let it out! "I did not do it and you can't prove it"...hehehe I'm USUALLY lucky and mine are silent but deadly....LOL Also, there are enough people around that nobody can REALLY tell WHO did it.... and if it does make noise... again, resort back to the poker face!
I just know from TOO MUCH experience...that is does NOT pay to hold it in. Everybody farts...and almost every time I'm at the gym even in yoga someone farts... I just don't know who!
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Re: shell!!!
"I did not do it and you can't prove it"...hehehe I'm USUALLY lucky and mine are silent but deadly....LOL Also, there are enough people around that nobody can REALLY tell WHO did it.... and if it does make noise... again, resort back to the poker face! 
