I've been watching you.

A spectator at a match in the North of England kept up a constant barrage of insults and derogatory remarks directed against the referee. Finally the ref could stand it no longer. He marched over to the stand and, looking the noisy spectator squarely in the eye, shouted, 'Look here - I've been watching you for the last twenty minutes . . .' 'I thought so,' the spectator shouted back. 'I knew you couldn't have been watching the game!'