Letter-perfect?

My two year old has continued to surprise us with the number of letters he knows. Quite on his own, he has learned S, W, M, A, F, and more.
Tonight, he was playing with some letter blocks, and I asked him to identify an "A" and an "I". Then I asked him to identify a "W".
His answer was "That's a "D.W.", Mommy!".
If your life is like mine, you understand his answer. Apparently he has been watching too much Arthur.