Why it destroyed you: This soothing, piano-heavy song kicks off during an uplifting moment, when Kara's baby survives delivery and Arizona learns that Kara's mother isn't dead after all. But then the baby's blood pressure starts dropping. The song intercuts a scene where Nathan and Meredith tenderly discuss how they sometimes dream about their lost loved ones. Play-It-Cool Nathan, while no McDreamy, suddenly transforms into Meredith's dark and twisty equal, and it's hard to contain our feels about them.