Secret Mythical Beast identification jingle.

When the discussion was brought up about secret mythical beast handshakes, I got to thinking, why not have other secret mythical beast things? Like a short little melody we can sing, hum, or whistle when we are in public places. To the non-mythical non-beasts, it would appear as if we where just singing, humming, or whistling, nothing out of the ordinary (unless you are yodeling), but a mythical beast would recognize it, and know that the singer, hummer, or whistler, is a fellow mythical beast! Not only would it give us the potential to make new friends, but if enough people did it,  it would also be like a scavenger hunt.

What do you think of this? good idea? or bad idea? Do you think there is enough people? Do you think I crazy?

What do you think the secret tune should be?