Appropro the Joshua Bell incident...
A good friend of mine is a painter and sculptor of some renown--many of his paintings are in museums. We sometimes get together in NY and visit the museums. One day we were at the Guggenheim and there was a group of art students doing sketches from the paintings. It occurred to me: Do they know who he is? No, of course not. They'll assume he's just another tourist. I turned to him and asked, "Are any of your works here at the Guggenheim?" His reply: "Not that I know of," which surprised me as I had assumed that you'd KNOW if your work was there, but of course that isn't true. If one of his works WAS there, well, I'd have to really restrain myself from telling all and sundry.
And my friend looks like a street person, but that's another story!