Bob Brunner's been visiting his friends on the farm...
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."