Gravity

So you're John Mayer. You've dazzled and crooned to crowds the world over. You're about to play "Gravity," one of your most legendary hits. How do you make it special? How about playing with a fan's guitar. And that is exactly what Meyer did. At a recent concert he played, a fan passed a guitar to the front, hoping Mayer would play it. 

He immediately obliged, much to the appreciation of the crowd, and continues playing the entire song with his fan's guitar. Not only did he play a set with it, but he signed the guitar and tuned it for the fan as well.