Can you help me understand this Social Science question?

Gestures Around the World – video

If you have traveled to any other countries, post experiences you may have had with regard to nonverbal communication.  If you have not traveled outside the United States, see if you can identify differences you may have seen on television or in the movies.  If neither of those applies, can you identify a gesture you commonly use that could possibly be misunderstood if you were to travel abroad?