Replying to Sounds that spook HORSES?

does anyone know any sounds that FREAK OUT HORSES????? SERISOULY i need to kno NOW! if ANYONE KNOWS POST IT cause when the riots start here, cops get on horses and if we can find out what noise 'spooks' them then WHOLEY SHIT!
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Josh Barilar
Sportin' the bath robe steeze.
since 1984

NO BRIAN, its I before E except after C, an when sounding like a in a neighbor in weigh and on weekends and holidays and all through out may and you'll always be wrong no MATTER WHAT YOU SAY!

You all take luck now! You take luck and care