Once upon a time, there was a lovely Roman arch.  Like other lovely Roman arches, this one depended on a keystone at the top to keep it standing.
    One day, the arch was acquired by a new arch management company, Arches R Us.  Before long, the new Arches R Us arch manager came to evaluate the new property.  He walked back and forth beneath the arch, looking it up and down with an appraising eye.  At last, he addressed the keystone.
    "Hey, you up there!" he called. "Who are you, and what do you do?"
    "I'm the keystone," said the keystone. "I hold up the arch."
    "Is that all, you lazy lump?" barked the arch manager. "And how long have you been doing this?"
    "Oh, about 2,000 years," said the keystone.
    "Well, simply holding up the arch won't cut it anymore, you slacker!" said the arch manager.
    "Why not?" asked the keystone.
    "Because we're raising the bar on you!" puffed the arch manager. "From now on, in addition to holding up the arch, you will have to suggest ways to redesign it to make it more attractive to tourists.  Not only that, but you must establish a visible presence in the tourist community and proactively pursue opportunities to enhance the arch's drawing power.  In the meantime, I'm going to start looking for a more modern keystone to replace you.  Understand?"
    "Yes," said the keystone. "Bye."  Then he removed himself from the arch and rolled somewhat clumsily away, as keystones aren't really designed for rolling.
    The arch collapsed in an indiscriminate heap of boulders.  Extending awkwardly from beneath the largest were the arch manager's arms and one of his legs.
    "Mmph!" he cried indistinctly, for the mixed fragments of teeth and stone somewhat slurred his speech. "What a surprise!  I wonder what possessed him to just pick up and go off like that?  What am I going to do now?  Architects!  I need architects immediately!  And laborers!  And building materials!  And ..."