Full Cup

The young clerk's responsibilities included bringing the
judge a hot cup of coffee at the start of every day.
Each morning the judge was enraged that the coffee cup
arrived two-thirds full. The clerk explained that he had to
rush to get the coffee delivered while it was still hot, which
caused him to spill much of it along the way.
None of the judge's yelling and insults produced a full cup
of coffee, until he finally threatened to cut the clerk's pay by
one-third if he continued to produce one-third less than the
judge wanted.
The next morning he was greeted with a cup of coffee that
was full to the brim, and the next morning and the morning
after that.
The judge couldn't resist gloating over his success and
smugly complimented the clerk on his new technique.
"Oh, there's not much to it," admitted the clerk happily. "I
take some coffee in my mouth right outside the coffee room.
That way I can carry it without spilling while I rush back.
I put it back in the cup when I get outside your office."