Lol! Yes, they come in all types. Mine in public are "Orphans", that is they have no pop. It takes years of dedicated practice and control to do this! It seems that women are better at containing them, just as they have better control over scratching an itch in public. Squeekers, flappers, bronx cheer, poppers, there are many diferent sounds. Some very famous writers have writen on the subject of flatulence. A google search might turn up some of these. Passing the blame is an age old tradition. Leaving a "scent trap" in the aisle at Wal-mart for the next shopper is a new variation on an old theme it seems. Just be sure to not be caught watching and laughing! 
