On Wednesday, after Japan unexpectedly defeated Germany in the World Cup soccer match in Qatar, Japanese supporters cleaned up litter in the stadium.
This may sound strange but it is a common thing for Japanese people to do. I've seen reports from other events with Japanese spectators doing the same thing. In Japan it is uncommon to see trash cans on the street or other places because people just expect to take their trash home. Public areas are neat and clean. This is one of the many things I love about Japan and Japanese culture.