Public Works Job

A man who was unemployed for several months gets a job with Public works.
He is to paint lines down the center of a rural road. The supervisor tells
him he is on probation and that he must stay at or above the set average
of 2 miles per day to remain hired. 

The man agrees to the conditions and starts the next day. The supervisor
checks and finds the man completed 4 miles. "Great," he thought, "this man
will work out." 

The next day he finds the man only did 2 miles but the supervisor thought,
"well he is still at the average and I don't want him to get discouraged." 

The third day however the man only did one mile and the Boss thought, "I
need to talk to him." The boss pulls the new employee in and says, "Son,
you were doing great, the first day you did 4 miles the second day 2 miles
but yesterday you only did one mile, Why? is there a problem? An injury,
equipment failure, anything keeping you from meeting the 2 mile minimum?"
The man replied 

"Well, I keep getting farther and farther from the bucket."