Personal hygiene
My kid no longer need to be reminded that he has to wash his hands right after he use the toilet. He’s been doing that since he was two. When he was still young, i used to tell him that his hands are full of germs. He will reply that he cannot see any on his hands. I will then tease him and say they are so tiny and he cant see them at all, unless i use magnifiers. I will even make funny signs with my hands and an ugly face and he will run away. I guess this is how he remembers to wash his hands, lol.