Saw a German game on TV recently when a ball was played over the top of the defence towards the corner flag to a player who was at least three yards offside. Everyone knew the player was offside yet the liner didn't put his flag up so the forward continued moving towards the ball which meant a defender had to chase back. Both were looking at the liner as if to say what the f*** is going on. It was only when the forward having run about 15 yards towards the ball touched it did the flag go up. Obviously everyone has different interpretations of what the law is and when to raise a flag. It's remarkable that the law is reffed differently not only from country to country but from game to game