"Cats," yes...I used to love the musical, but I've never actually picked up the book. It's weird, though...sort of like the way I used to love Ursula K. LeGuin's "Catwings" series far before I discovered her as an adult SF author. (I still like "Catwings" better than most of the other things I've read by her.)

yet another theory that I'm the only real person in the world and that God has created the universe around me, because how do I know if people are actually people?
I had that idea as a kid. I think a lot of kids do; they haven't really learned empathy yet. Solipsism for the win, I guess. (I still wonder about that sometimes, but ever since I've started to really like people, the idea makes me too upset to think about dispassionately.)