dunno....but if you start to wear one of their white face masks (you know - the ones used for dust) and tell them they are dirty mofo's every time they fart!!! i would recommend a stink bomb in the office. organise a half day for yourself and set it off as you are leaving, and tell them it was revenge the next time you are in work. also, you could consider complaining to your boss, saying you will take it further if the farting doesn't stop. but i would try the other ideas! you have my sympathy! x