Sam of the Ten Thousand Things has a video of Joni Mitchell singing 'A case of you' on his blog. I love that song. Take time to go over for a listen and to read some of his other good posts.
I shared the following story in my comment to her video and decided it was worth copy/pasting to share here, too...
When I was sailing through the Vineyard in my thirties, we anchored and went ashore for a drink and food at a nearby pub. A small band was playing. One came over, obviously flustered, and asked if I was Joni Mitchell. It was both flattering (I had her same trim build, same height, and similar cheekbones and the long sun-bleached hair) and yet heartbreaking. I saw the hope in his eyes...he was possibly being 'discovered' , since we'd told the barkeep we heard a band was playing when we came in. To say no I wasn't is a moment I don't think I'll ever forget. The moment I was 'Joni' for a second or two, the moment I felt what it must feel like to be a celebrity, the moment I dashed someone's hopes with no intention of doing so.
EDIT: The video on Sam's site has gone down his blog some, so if you don't find it, here it is again. Thanks for this, Sam!