Just one more thing I neither like nor understand about soccer.
Vuvuzelas (that's what they're called) themselves don't actually have anything to do with football (that's what it's called), they could be equally used by audience on any other sport event. Fans from some nations use specific cheering requisites, if that's the proper term in English, whose sound becomes a sort of a trademark of the fans from that nation. These requisites are usually used to make an occasional sound during the match for better atmosphere (for both the audience and the team they're cheering on) and also for a more energetic celebration of a goal by sounding the requisites off more frequently when the team scores a goal. That's precisely the thing that vuvuzelas don't have in common with any other cheering requisite - instead of using them to make an occasional sound or frequent sound only when the team scores a goal, they're blown constantly and produce a constant monotone noise. Moreover, http://en.wikipedia.org/wiki/Vuvuzela and that, coupled with the fact that each vuvuzela produces a monotone sound of equal frequency (http://en.wikipedia.org/wiki/Vuvuzela) is the reason why a bunch of vuvuzelas sounding off in unison will produce an extremely loud noise, amplifying each other's sound by a far greater degree than any other cheering requisite. These two things, that they're used constantly thus making their sound basically meaningless and nothing other than an annoyance and that they're so extremely loud, are the reason why many people are trying to convince FIFA to ban them from football matches.