Two guys were working for the city. One would dig a hole - he would dig,dig, dig. The other would come behind him and fill the hole - fill, fill, fill. These two men worked furiously, one digging a hole, the other filling it up again.
A man watching from the sidewalk couldn't understand what they were doing.
He says to the hole digger, "I appreciate how hard you work, but what are you doing? You dig a hole and your partner comes behind you and fills it up again!"
The hole digger replies, "Oh yeah, must look funny, but the guy who plants the trees is sick today."