When I learned the reading for 歩, the mnemonic said to imagine stepping on a Hoe and having it smack you in the face. Kouichi said that more vivid imagination in your mnemonics will stick them into your mind more firmly. I’ve got Aphantasia, which means that I can’t really imagine pictures, only smells/sounds/tactile sensations, but I figured I could still make it work. Over the course of three seconds, I imagined it hitting my face, and my vision going out. I put my hand to my face, and my fingers feel sticky, and I can also feel small, hard bits. Fragments of bone? Is that brain matter? It becomes increasingly apparent that my entire face has been smashed in by this Hoe, and I’m probably going to die soon. Waves of nausea hit me as the horror seeps in. Then I snap back, still feeling sick, but otherwise fine.
It wasn’t worth it. Don’t make your mnemonics too vivid. I still wince whenever I see 歩.