Related:

• There are three types of people in this world: those who can count, and those who cannot.
  -- Carl G. Hostnik...
• There are two kinds of people in this world: those who can get any job they want, and white males.
  -- Chris Pirillo (chris@lockergnome.com)...
• There are three kinds of researchers: Those who can do math and those who cannot.
  -- Tom Rusk Vickery...
• Those who can, do. Those that can't criticize.
• There are two kinds of people in the world, those who believe there are two kinds of people in the world and those who don't.
  -- Benchley's Law of Distinctio...
• There are two kinds of men who never amount to much
  hose who cannot do what they are told, and those who can do nothing else. -- Cyrus Curti...
• Those who can, do. Those who can't, get promoted to management.
• Those who can, do. Those who can't join the Democratic Party
• Those who can, do; those who can't, simulate.