Like climbing, pub quizing has a self policing system of ethics based on honesty.
No bribary, team collaboration, mobile phones, WAP, shouting out the incorrect answer really confidently, shirking rounds, hogging the picture round or pens, looking in the encyclopedia on the pub shelf, over use of the dude rule, no not giving an answer (cos haf the time your guess is right), no copying, no changing your answers after they're read out, no self-marking, internet anagram solvers, hesitation, repetition and no deviation. Also going to quizes with easy questions that are too easy for you is really unsatisfying.