There were two fellas working for the city council, one would dig a hole, the other would follow behind him and fill it in.
They worked furiously all day without rest, one guy digging a hole, the other guy filling it in again.
An onlooker was amazed at their hard work, but couldn't understand what they were doing.
So he asked the hole digger, "I appreciate the effort you're putting into your work, but what's the story? You dig a hole and your partner follows behind and fills it up again.
The hole digger wiped his brow and sighed, "Well, normally we're a three-man team, but the bloke who plants the trees is off sick today!"