Another point. I happened to be shopping in Brighton on Saturday, and there were hordes of fans milling around the streets and the station, many blowing rowdily on vuvuzelas. But at least one youth seemed to have got hold of an AirZound or something like it - different note and a helluva a lot louder! He certainly didn't appear to have anything to do with cycling! Now if the fans in SA get hold of AirZounds and take them into the stadium!? 


(how long does the reservoir last?)



(how long does the reservoir last?)
, anyway... the footie fans got to hear about this and decided that the sound would also "kill" their "enemies" - the opposing team - hence the constant blowing of them to kill off the other team. If something similar were to be the case in the UK it would probably raise a storm of protest about religious hatred or something.
the players can't hear each other on the pitch and c) it destroys the atmosphere at the games.