Those of you who follow the awesome Worse Than Failiure (A.K.A. 'WTF!') - blog (and if you don't you should!) will already know about this, but if you don't I highly recommend checking out the recent OMGWTF calculator competition. The brief: design a replacement to windows calculator. The result: some of the most incredibly overengineered, textbook examples of how-not-to-program you could possibly imagine. The latest entry, for example, is based on modeling a transistor in fully object oriented code, and linking them up to form the calculation engine.