A cowboy from Texas hauling his horse in a trailer to a rodeo gets
pulled over by an Oklahoma State Trooper for speeding. The trooper
started to lecture the cowboy about his speeding, and in general began to throw his weight around to try to make the cowboy feel
uncomfortable.

Finally, the trooper got around to writing out the ticket As he was
doing that, he kept swatting at some flies that were persistently
buzzing around his head.

The cowboy says, "Y'all havin' a problem with them circle flies ?"

The trooper stopped writing the ticket and said, "Well yeah, if that's what they're called. But I've never heard of circle flies."

"Well, sir," the cowboy replies, "circle flies hang around ranches.
They're called circle flies because they're almost always found
circling around the back end of a horse."

The trooper says, "Oh," and goes back to writing the ticket. But, a
moment later he stops and asks, "Are you callin' me a horse's ass?"

"No, sir," the cowboy replies, "I have too much respect for law
enforcement to call y'all a horse's ass."

"That's a good thing," the trooper says and goes back to writing the
ticket.

After a long pause, the cowboy, in his best Texas drawl says, "Hard to
fool them flies though."