I remember sitting round a campfire at the Willow Festival in Northern Illinois. The campground as you approach looks like the M.A.S.H. set and has usually only been cleared out of cows the day before the festival so you have to be careful of where you step. The cows are moved to neighboring pastures but as twenty or thirty song cicles go on into the night, the cows "moo" in unharmonic response to the camp music. It may have been the booze but we placed more blame on the cow emissions when we wrote the parody "Methane!"
I do not remember any of the lyrics but it was funny at the time.