Related:

• We [Doctors and Bartenders] both get the same two kinds of customers -- the living and the dying.
  -- Dr. Boyce, "The Menagerie" ("The Cage"), stardate unknown....
• The world has two kinds of people: Friends and Targets.
• There's more to living than not dying.
• 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...
• If something's not worth dying for, it's not worth living for.
• There are two kinds of people in this world: Those that want to BE something, and those that want to DO something.
  (There is less competition in the second category.)...
• There are two kinds of people in the world: Those we love, and those we don't understand.
• 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)...
• In this world, my friend, there are two kinds of people
  hose with loaded guns and those who dig. You dig....