As a child playing the piano became a very weird experience (in hindsight). I'd need to practice until a piece became ingrained in my memory, and the only way I could play a piece would be to not actually think about it, and think about something else. As soon as I thought about what I was playing, I'd forget how to play the song. I wouldn't even know where I was, and could only pick up again either at the beginning or major points in the song. Weird.