Originally Posted by fromYYZ_flyer
I like to do this if in a washroom with no one but the offender. A guy is talking on his cell phone in the washroom or in a stall. I finish up and then stand near the guy's stall and procede to make the loudest farting noises by blowing into my hands. As soon as the guy is onto me I make a dash for it and blend in with the crowd.

Are you sure the other guy's the rude one?? People rant how they don't like people talking loudly on their cell phone in public, so perhaps this guy went into a (near) empty restroom to be able to speak louder on a poor reception phone (as I've done this in consideration of others). And YOU are offended HOW?
I can't help but think in many cases of rude behaviors witnessed, it's a result of jumping to conclusions.