Two guys were working for the city. One would dig a hole, the other would come behind him and fill the hole. These two men worked furiously; one digging a hole, the other filling it up again.
Another man, a bit confused, was watching from the sidewalk and couldn't believe how hard these men were working. Finally he asked the 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 digger replied, “Oh yeah, it must look funny, but the guy who plants the trees is sick today.”