A cowboy gets pulled over by a 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 buzzing around his
head.

The cowboy sez, "Y'all havin' some problem with circle flies?"

The trooper stopped writing the ticket and said, "Well yeah, if that's
what they're called. But I never heard of no 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 says, "Are you callin' me a horse's ***?"

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

"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!"