One hot, steamy summer afternoon a farmer is pulling a wagon load of manure with his tractor and a long line of traffic is trapped behind him. When a cop passing by notices the traffic he turns on his lights and siren, whips his car around in the road and races up to the farmer and motions him to pull off the side of the road. The cop pulls in front of the farmer, gets out of his car and walks back to the tractor where the farmer is still seated. He carefully looks over the tractor and wagon, then tells the farmer he can't be on a busy road suck as this and he is going to give him a ticket for obstructing traffic. The whole time he is writing the ticket he is swatting the flies away from his face but soon enough he is done and hands the farmer the ticket. The cop then comments on the terrible smell and all the flys that he has to keep swatting at. The farmer says to the cop "thems circle flys". The cop gets a puzzled look on his face and says "whats a circle fly?" to which the farmer says "thems the flys that circle a horses ***!". The cop says "sir, did you just call me a horses ***?" and with batting an eye the farmer says "no sir I didn't, but you just can't fool them flys!"