If a thought is energy.. what kind of thoughts produce the most energy?

Energy is not a physical unit. It is a philosophical concept and an accounting technique used to analyze mechanical and chemical exchanges. In nuclear physics it is defined as a color of light, in biology it is a synonym for metabolism, and in public utilities they say energy when they mean connectivity. If you hear the word in any other context, the speaker either doesn't know what he is talking about, or is trying to sell something you don't need.