UNTHINKABLE: This Safety Message More Popular Than Rihanna Is Now a Global Phenomenon

Unsurprisingly, one of the catchiest songs ever created topped the iTunes charts. It beat epic songs by Rihanna and Drake and narrowly missed topping Adele and even Gangnam Style. Away from the charts, this song sparked a global movement -- merchandise and microsites, mobile games and parodies galore. One song and one video, going crazy viral, and snowballing into something much larger than itself. And while none of that seems all that surprising in our digital world today, when you learn about who created this song -- and the insanity that ensued -- it'll seem like pure insanity.

You might even call it ... Unthinkable.