i had this idiot 10 feet to the right of my mic stand last week who occasionally would just YAAAAAHHHHHOOOOOOO for no reason ... completely at random, not tied to anything going on in the music or crowd or anything, except maybe the neurons misfiring in his brain.
anyway, i clipped out the worst of it by crossfading, and one of them that showed up a nanosecond before a song began i just cut out entirely.