I was reminded of this thread today....
DD was playing with her doll when she decided that her doll needed to go potty. So we grabbed a megablock that was laying nearby and put her doll on their to pee. She then asked for her favorite book and "read" to her doll on the potty. Some of it was just nonsense but she made sure to point out the daddy and the baby in the book and tell her doll all the animal names and what sounds they make. Also, she'd check every now and then to see if her doll had peed or not. I was just trying not to giggle while she was doing it, it was so cute!