After pulling a farmer over for speeding, a state trooper lectured him about his speed, pompously implying that the farmer didn't know any better and tried to make him feel as uncomfortable as possible. He finally started writing out the ticket, but had to keep swatting at some flies that were buzzing around his head.
The farmer said, "Having some problems with circle flies there are ya?"
The trooper paused to take another swat and said,
"Well, yes, if that's what they are. I've never heard of circle flies."
The farmer was pleased to enlighten the cop. "Circle flies are common on farms. They're called circle flies because you almost always find them circling the back end of a horse."
The trooper continued writing for a moment, then stopped,
"Hey, are you trying to call me a horse's behind?"
"Oh no, officer. I have too much respect for law enforcement and police officers for that."
"That's a good thing," The officer said rudely, then went back to writing the ticket.
After a long pause, the farmer added, "Hard to fool them flies, though."