2015-12-20T14:53:47-05:00 https://ximage.c-spanvideo.org ...

Today, we know it as the unmistakable symbol of raving, expressing the simple joy of hitting the dancefloor, together as one. But the birth and evolution of the smiley face is stranger than you think.

The story behind the happiness symbol isn't as cheerful as you'd expect. The Mona Lisa might have the most iconic smile in history, but one could argue the yellow smiley face comes pretty close.