Paddy on his first day at the roadworks, was given the task to paint white lines on the road. When his boss picked him up at the end of the day he saw that Paddy had painted a 2 km line. “A great worker” thought his boss and told him to do the same the next day. That day he only painted 1 km, still a great achievement. The third day he painted 500 meter, the fourth day only 200.
“What’s the matter with you?” asked his boss, “you did so much better the first day”.
“Yeh” said Paddy, “but don’t forget that I have to walk every day more and more all the way back and forth to the paintpot!”