An old fellow sat on a park bench watching the two blondes as they worked their way toward him. One dug a hole and waited while the other filled it in. They worked their way down the street, digging and filling up hole after hole, all the way down the street, stopping in front of him.
“Ladies, I have to admire your industry. Why on earth are you working so hard digging holes just to fill them right back up?”
“Oh, we work for the city planting trees. I dig the holes. She fills them up. The girl who puts the tree in called in sick today.”