My favourite one's are all the Kate ones: "Tabula rasa", "Whatever the case may be", "Born to run", especially "What Kate did" (Guess why^^)
And "I do", (despite Kate sleeping with Sawyer) was really amazing! It was so thrilling I couldn't go to sleep and had to talk about the episode for a very long time!

__________________
- Does anyone know how to use a gun?
- I think you just pull the trigger.

- Hey kid, what's eating you?
- Nothing, he's at the top of the food chain!
(The Lion King^^)