Did you watched a video called "Cute girl has a catchy dance" on YouTube? Or maybe a friend sent you the link, or it was shared on Facebook?
It's uploaded on 7th of September and circulates the Net really fast - for 2 weeks it was seen almost 4 million times!
Interested about seeing the cute girl dancing? Watch the video till the end and you realize that it's an ad for the new Galaxy phone by Samsung.
Smart, ain't it?