European soccer rivalries are just like major American sport rivalries, except with riot police and coaches getting full coke cups to the face. Yiannis Anastasiou, coach of Panathinaikos, was having a pretty good day -- beating rival Olympiakos 2-0 -- when a rival fan threw the beverage (with ice!) at the opposing coach.
I'd suggest the Greeks adopt the American method for discouraging such behavior: charging people their entire life's savings for one in-game drink. [SB Nation]