Favorite Grammys moment/performance

The Grammys are tomorrow, as if we're not all still recovering/reeling from a certain other awards show last week. And while there might not be as much drama (although, who can say!) the Grammys always have their fair share of water cooler moments. (Hello, J.Lo's iconic green dress!)

This got me thinking about Grammys moments and performances that have always stuck with me. It's unbearably bittersweet to watch now, but Amy Winehouse's stunned reaction to winning Record of the Year for "Rehab" after just bringing the house down still gives me goosebumps: https://www.youtube.com/watch?v=x0q3Re5ksVg

What are your favorites?