周末一笑：

內科

They know everything & do nothing.

外科

They know nothing，but do everything 。

精神科

They know nothing，and they do nothing，but they tell you everything。 

议员

They know something， promise everything，and  do nothing。

律師

They know nothing，they do nothing，but they charge you for everything .

最高元首, 如总统

Their left brain has nothing right and their right brain has nothing left。