Grey's Anatomy, Season 6

Meredith:
[voiceover] No matter how many plans we make or steps we follow, we never know how our day is going to end up. We'd prefer to know, of course, what curveballs will be thrown our way. It's the accidents that always turn out to be the most interesting parts of our day, of life, the people we never expected to show up, a turn of events we never would have chosen for ourselves. All of a sudden you find yourself somewhere you never expected to be and it's nice, or it takes some getting used to. Still, you know you'll find yourself appreciating it somewhere down the line. So, you go to sleep each night thinking about tomorrow, going over your plans, preparing your lists, and hoping that whatever accidents come your way will be happy ones.