The unexpected is what changes our lives.

"We all think we're going to be great. And we feel a little bit robbed when our expectations aren't met. But sometimes, our expectations sell us short. Sometimes the expected simply pales in comparison to the unexpected. You've gotta wonder why we cling to our expectations, because the expected is just what keeps us steady... standing... still. The expected is just the beginning. The unexpected is what changes our lives." 

--Meredith Grey, "Grey's Anatomy"