One of those days.

"You never know the biggest day of your life is the biggest day. Not until it's happening. You don't recognize the biggest day of your life, not until you're right in the middle of it. The day you commit to something or someone. The day you get your heart broken. The day you meet your soul mate. The day you realize there's not enough time, because you wanna live forever. Those are the biggest days. The perfect days."

Grey's Anatomy