Seems a Chinese girl escaped being kidnapped by giving the "OK" signal with her hands at an airport. This alerted people around her to talk with her and the kidnapper ran and she was returned to her parents.
Although I couldn't find the video, I did find this photo:
And so, if you see someone making this sign near you, introduce yourself. Ask them directions or something. The life you save could return the favor one day.
~ Dr. TV Boogie....