Dear singing coffee shop patron,
Omigod, do you know all the words to Elton John's Tiny Dancer, too? I thought I was the only person in the world who did! But now that you've undertaken to sing it out loud and whistle the music-only parts, I know how much we have in common, and I am so impressed by you. I bet this bond of cultural knowledge is unique and important, since no one else in the coffee shop knows this very obscure song, and they really appreciate your singing the words for them. Singing coffee shop patron, you and me are meant to be.