Vonmausberger
The esteemed behavioural philosopher from the Bonk School and author of Ritual Aggression in Pubescent Rats, a theory used to make sense of Ankh-Morpork street gangs.
Annotation
Another reference to Roundworld behavioural psychologist B.F. Skinner, who noted from some rather unpleasant practical experiments that too many rats crammed into too small a space inevitably led to territorial violence and savage dominance games - the rats took it out on each other, rather than gang up together to declare war on the behavioural scientists and break out of their confinement. Perhaps a reason why Vetinari tolerates a certain amount of gang violence in the City.