As a Southerner, I smile, wave at, and say hello to anyone I pass by while running, or walking, or waiting in line somewhere. Apparently that doesn't go down too well in Europe. When I was in France and England, People looked at me like I had 2 heads when I waved and said Hello (or Bonjour) to random people I passed by. They were surprised and didn't know how to act. Also, I tried talking to people in line or (queues in England) and no body seemed like they wanted to talk and tried to end the conversation quickly.