Today my wife observed C reciting the alphabet...backward. He would say a letter, scrunch up his face as he thought earnestly about what was next, and then happily announce it before proceeding to the next one.
We've never taught him the alphabet backward, and I have no idea why he felt the need to try it. Just part of his love of letters, I guess.
And, while one therapist has lightly cautioned us about overly encouraging his obsession with letters and numbers, it's exciting to see him tackling such complex problems, focusing on them with such intent, and taking great pride in showing us his achievement.