Sitting among the home fans can be a perilous pastime for the undercover away supporter who has to sit on his or her hands to try to hide their allegiance. It often undermines the enjoyment of a game and there are certain rules you have to stick to if you want to avoid a smack in the mouth: no singing, no chanting and, certainly, no celebrating. Silence is usually the best policy, rising to your feet if the opposition (ie the home team) scores, berating a lapse in defence to disguise your glee when the away (ie your) side scores.