Brainstorming: children’s stories

So I have a three-year old kid, and will usu­ally read or tell him a bed­time story.

That is a nice op­por­tu­nity to in­tro­duce new con­cepts, but my ca­pac­ity for im­pro­vi­sa­tion is limited, es­pe­cially to­wards the end of the day. So I’m ask­ing the good peo­ple on LessWrong for ideas. How would you wrap var­i­ous less­wrongish ideas in a short story a lit­tle kid would pay at­ten­tion to?

I’m mostly in­ter­ested in the as­pects of “prac­ti­cal ra­tio­nal­ity” that aren’t go­ing to be taught at school or in chil­dren’s books or chil­dren’s TV shows—so things like Sunk Costs, tak­ing the out­side view, won­der­ing which side is true in­stead of ar­gu­ing for a side, etc.

Poin­t­ers to out­side sources of such sto­ries are wel­come too!

Edit: ac­tu­ally, if you want to share ideas of games or ac­tivi­ties of the same kind, go ahead! :)