A biker, who worked on a horse farm, got pulled over by a state trooper for speeding. Since it was a rural road with no traffic, the biker tried to get the trooper to let him off with a warning. Instead, the trooper lectured the biker about speeding, and in generaly gave the biker a hard time.

Finally, the trooper got around to writing the ticket, and as he was doing that he kept swatting at some flies that were buzzing around his head.

The biker said, "Having some problems with Circle Flies ?" The trooper stopped writing the ticket and said--"Well yeah, if that's what they are--I never heard of Circle Flies." So the biker says--"Well, Circle Flies are common on farms. See, they're called Circle Flies because they're always found circling around the back end of a horse." The trooper says, "Oh," and goes back to writing the ticket.

After a minute he stops and says, "Hey - Are you trying to call me a horse's ass?" The biker says, "No officer. I have too much respect for cops to even think about calling you a horse's ass." The trooper says, "Well, that's a good thing," and goes back to writing the ticket.

As the trooper hands him the ticket, the biker says,

"Hard to fool them flies though."