A farmer got pulled over by an RCMP officer 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 officer 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 farmer said, "Having some problems with circle flies there are ya?"
The officer stopped writing the ticket and said, "Well, yeah, if that's what they are called... I never heard of circle flies."
So the farmer said, "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 officer said, "Oh," and went back to writing the ticket. Then after a minute he stopped and said, "Hey, wait a minute... are you trying to call me a horse's rear end?"
The farmer said, "oh no, officer. I have too much respect for law enforcement to even think about calling you such a name."
The officer said, "Well, that's a good thing." and went back to writing the ticket.
After a long pause, the farmer said, "Hard to fool them flies, though."