Sammy really responds to the Sesame Street shows. Oh, he likes to watch the Wiggles, but they just seem to sing songs about "Fruit Salad". With Sesame Steet, Sammy is answering questions from the TV...talking back. When they introduce a letter, Sammy dutifully repeats it out loud.
Sammy also has been working on the Alphabet Song. He doesn't quite know all the letters by heart, but he's able to finish off many of the sequences.
In some ways having a child is an excuse to relive your own childhood...