As Governor of Texas, George Bush got to ceremonially act as a state trooper for a day.
While operating a speed trap Bush pulled over a Texas farmer. He lectured the farmer about his speed and the necessity of obeying laws made by his superiors, and in general threw his weight around.
Finally, he got around to writing the ticket, and as he was doing so he kept swatting at some flies that were buzzing around his head.
The farmer said, "Having some problems with circle flies there, are ya, Sir?"
Bush 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 horses."
Bush says, "Oh," and goes back to writing the ticket.
After a minute he stops and slowly says, "Hey... wait a minute, are you trying to call me a horse's ass?"
The farmer says, "Oh no, Governor, I have too much respect for you to even think about calling you a horse's ass."
Grinning broadly, Bush 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."