We assume the really serious changes in our lives happen slowly, over time. But it's not true. The big stuff happens in an instant. Becoming an adult, becoming a parent, becoming a doctor: one minute you're not and the next, you are. Ask any doctor and they can point to the one moment they became a physician. It usually isn't med school graduation day. Wherever it is, nobody forgets it. Sometimes you don't even know anything is changed. You think you're still you and your life is still your life, but you wake up one day and look around, and you don't recognize anything, not anything at all.
- Grey's Anatomy