I don't know how they can stop fans from doing the "Wooo", it'd be like banning the wave
Short answer: they can't
As a fan. Just tell the idiot doing it that our players HATE the sound. It's all you can do.
I've said all winter — they talk about this team winning the division — and my comment is, they won't win it because, at the end of the day, they still are the Chicago Cubs, and they will figure out a way to screw this whole thing up. - Marty Brennaman
I thought it started with people barking during last years "Bark in the Park" and it somehow turned to a WWWWOOOO.
"Boys, I'm one of those umpires that misses 'em every once in a while so if it's close, you'd better hit it." Cal Hubbard
Dont stop the wooooo. Apparently most the fans who actually care to stay till the end of the games are the ones Wooo-ing.