When I was about 7 years old and learned about Rashi, I decided that I was going to be like Rashi and write a peirush on the Siddur (since the Chumash had already been done by Rashi). I gave myself an acronym (my initials) and sat down to work. I had a chiddush on Ma Tovu, but I couldn’t write it down right away because I decided I had to start from Modah Ani.
Well, guess what? I never got up to Ma Tovu because my sisters called me out to play before I got very far. And I no longer remember what my chiddush on Ma Tovu was. Oh, well.