At an air show - multiple times - "Are you the official photographer?" Not a silly question, but interesting.
When shooting model in a park - "Do you work for Playboy?" followed quickly by "Can I watch?"
At Ren Faires - "Now that's a Flemish painter!" - You have to know the lingo 
And all the time, anywhere there's someone with a camera and a scene - "Will you take me and my (wife, girlfriend, mom, etc)'s picture?" And they get annoyed if I don't immediately know the controls on their particular camera.
Mark




