A farmer got pulled over by a state trooper for speeding, and the
trooper started to lecture the farmer about his speed, and in general began
to throw his weight around to try to make the farmer uncomfortable.

Finally, the trooper got around to writing out the ticket, and as he
was doing that he kept swatting at some flies that were buzzing around his
The farmer said, "Having some problems with circle flies there, are ya?"

The trooper stopped writing the ticket and said--"Well yeah, is that
what they are--I never heard of circle flies."

So the farmer says--"Well, circle flies are common on farms. See,
they're called circle flies because they're most always found circling
around the back end of a horse."

The trooper says, "Oh," and goes back to writing the ticket.  Then
after a minute he stops and says, "Hey...wait a minute, are you trying to
call me a horses ass?"

The farmer says, "Oh no, officer. I have too much respect for law
enforcement and police officers to even think about calling you a
horses ass."

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

 After a long pause, the farmer says, "Hard to fool them flies though."