This is the third and final volume in what has become known as the ÒPotty Training trilogy,Ó offering in toto 1500 pearls of wisdom at the rate of 500 quotes per volume. Vol. 1, ordinary ÒPotty Training;Ó Vol. 2, ÒAdvanced Potty Training;Ó and now Vol. 3, ÒA PhD. in Potty Training.Ó