Maybe i'm asking too much, but why don't put something like: if a referee is too stricht with a team, the supporters throw something from the stadium in the field (bottles, oranges..), or a supporter come inside the field to hurt the referee.
I mean , something where u can say "this is real different match from another one" (another thing could be throwing piece of papers on the field from the stadium before the match starts and they remain there during the match). what u think about it?