Vuvuzelas!

[MissLadyLoki]

I said no. I mean, yeah the buzz is annoying, but it isn't offensive in any way (I'm looking at you, Braves fans that do that chop with the styrofoam tomahawk) and in many ways, it reminds me of this quacker fans play at games for this minor-league baseball team, the Long Island Ducks (it's a beak-shaped whistle that nakes a quacking sound when blown into it). i don't see those horn-things posing a problem unless they, say, start attacking each other with it.