OK, this is a silly one, and I even have to admit you can find a few toys like this on the internet. A site for teachers describes how to make one using a pencil. But I feel entitled posting this Instructable because I can remember when my dad made one for us kids roughly 60 years ago. My brother and I were completely baffled how he would rub a little dowel on a notched stick and the little wooden propeller at the end would start spinning, and then he would say, "stop and go the other way," and without the slightest perceptible change in anything he was doing, the propeller would obey. And of course we would try and try and fail.
Naturally there was a trick, and for those who have not seen this toy, I will reveal the trick at the end of this Instructable.
You need a few little pieces of scrap wood -- almost any kind will do, and a small brad.