Worth a thousand..

Yes that is the finger he is showing there.
This is from my treasured copy of The Last Hero (Terry Prattchett) the art is by Paul Kidby, an artist truely in tune with Pratchettes vibes.
wikipedia has an entry on this work of art
http://en.wikipedia.org/wiki/The_Last_Hero
you can also read about the
The Thieves' Guild which "was established early in Lord Havelock Vetinari's rule of Ankh-Morpork. Lord Vetinari realised that what people crave is stability, and that, while it is impossible to stamp out crime altogether, it is possible to regulate it. The major gang leaders of the city were therefore called to the Patrician's Palace, where they agreed to be held responsible for ensuring a socially acceptable number of thefts."
and lots more about Ankh Morpork, one of the most interesting cities after Colombo for people who like living on the edge...
note "While initially the main money-making venture of Thieves' Guild members remained theft, albeit under strict guidelines and leaving a receipt, more recent books show a system of "insurance", whereby people may pay a fee directly to the Guild and therefore become immune to robbery for a specified period."

ps Part of the Code of Conduct :http://en.wikipedia.org/wiki/Ankh-Morpork_Thieves%27_Guild#Code_of_Conduct
Members are required to carry their membership cards during all offcial activites (i.e. crimes).