Someone hit on a good idea and is making a business out of it.
Chicago Pizza Tours loads you on a bus and takes you all around Chicago sampling pizza's!
Takes all the guess work and planning out of the equation if you're not sure where to go in Chicago for Pizza.
This sounds very similar to the Roadfood bus tours and the NJ Hot Dog Excursions only they made a viable business out of it!! http://www.chicagopizzatours.com/