Ritual Aggression in Pubescent Rats

A behavioural treatise, written by Herr Doktor Vonmausberger, which is used by Mr Nutt as the underlying theory enabling him to make sense of the behaviour of Ankh-Morpork football fans such as Trevor Likely, Algernon Stollop, and Andy Shank. In any other race, explaining his insights to Algernon in that place and time might have been terminal, but not for Mr Nutt...