Here is what is mentioned on the website:
"Soccer has given us some of the most passionate rivalries in world in any sport, which in turn produce atmospheres that aren't matched by any other game on the face of earth. One of those rivalries is PAOK-Olympiacos in Greece. A fierce, intense hatred fills the country weeks before the match. And when it comes to kickoff, things get nuts. But not just in soccer. In volleyball, it is not too shabby either. Of course, no fire inside the building as that would be a disaster waiting to happen, but check out the PAOK fans ahead of a recent rivalry match chanting in unison. Goosebumps. You should see the atmosphere at the U12 field hockey games".