Simple solution to the farting problem.... as someone said "its the moral responsibility of everyone not to have anything heavy before the exam" similarly everyone should apply deo and scent all over the lower half of their clothes too along with the upper so that that even if u eat something heavy instead of being a hindrance it becomes a pleasant experience for fellow CAT-Takers!
Just imagine with a heavy breakfast u may not make it to the IIMs but u can be instrumental in someone else being selected for the IIMs!
On a more serious note, I would like to quote my experience last year...my center was Presidency College, Kolkata. As soon as we started on the 15th of feb, loud noises of synthesizers and octapads started coming from the second floor. They were preaparing for their annual function! It was like hell! The singular reason for me doing very badly, because it took away nearly 20 mins to tell the invigilators and silence them! It also took away my concentration! So guys please make sure that nothing of that sort is going on before the exam, at the exam center. I wonder till date how a college of presidency's stature couldn't take care of that. And what the representatives from the IIMs were doing? They don't know but a few students of that college ruined a year of atleast a few 100 guys and gals that day!