Okay, let's hope it's not a new trend. The above video is shocking, but mostly because these girls don't get punched in the face. Not once! We're sure there was a lot of hostility left on the cutting room floor.

So what is the hair petting game? The girls in the video demonstrate by walking around Manhattan and secretly petting the hair of strangers when they are walking behind them. A risky move! And one we hope does not catch on.

Wear a hat out there.