http://videos.sapo.pt/yyiwz67i2IpSuBwiRdh9
watch the 14th second. can you spot an offside there by the player who scored? I can't. But the assistant ref somehow saw an offside there and annuled the goal, which would have made sporting champions. You see, here in Portugal, either the refs are in Pinto da Costa's pocket (Porto president), or they support Benfica, and they will do anything to protect them, like that time when the ref prolonged the game for 15 mins until benfica scored a goal. In Europe, it is rarer, but in that Fiorentina case, the ref SAW the punch, but gave a yellow card, when the correct sanction is a red card.