That's the earliest dumb thing I can remember doing. What's your earliest dumb memory?
(Actually, I have a contender. When I was even younger, perhaps two or three, I remember being convinced that if I just pulled hard enough, I could grab the chains of a swing and lift it up and sit on it and hold myself up while I swung. No structure was needed, it would be all me. I was very upset when it didn't work. Truly, I suspected something was radically wrong with the world. It should have worked!)