1. Joey and Chandler
    The best pair of all.
  2. Monica and Rachel
    I love when they switch names for health insurance and the antics that ensue.
  3. Chandler and Rachel
    The cheesecake episode is one of my favorites. They aren't together often (just the two of them), but they have a fun dynamic.
  4. Phoebe and Joey
    "Ken Adams." "Regina Phalange."
  5. Chandler and Monica
    They complement each other so nicely, even before they officially got together.
  6. (Sorry, Ross.)