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 head. The farmer said, "Having some problems with circle
flies there, are ya?"

The trooper stopped writing the ticket and said--"Well yeah, if
that's 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 almost 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."