An old farmer was hauling a load of manure when he
was stopped by a state trooper. "You were
speeding," the cop said. "I'm going to have to
give you a ticket."

"Yep," the farmer said as he watched the trooper
shoo away several flies.

"These flies are terrible," the trooper
complained.

"Yep," the farmer said. "Those are circle
flies."

"What's a circle fly?"

"Them flies that circle a horse's ass,"
answered the farmer. "Them are circle flies."

"You wouldn't be calling me a horse's ass,
would you?" The trooper angrily asked.

"Nope, I didn't," the farmer replied. "But you
just can't fool them flies.