certain introductory movie quite regularly. So at some point he decided that THX was not only an essential part of movies but a theater experience all its own.
When we show him his ten minutes of movie in the morning, he regularly asks us to start the movie from the beginning just to see the THX sequence.
So it is little wonder then that he takes not-Scrabble tiles and spells out THX with them.
He's been able to read Bob, Disney, Mom, and Dad for a while now. He's recently also acquired THX, Wall-E, Toy Story, Pixar ["And you jump on the I!"], and most of the time Hyrum, but he also thinks Hanes spells Hyrum.
Thank you, Pixar and LucasArts.