Idees fixes

My older sister and little brother are reading The Wind in the Willows.  My sister loves Mr. Toad’s wild idees fixes that get him into deep trouble.  He gets ubsessed with horse drawn caravans, motor cars, and more. He changes from one to another very quickly just like my little brother. I don’t think his is quite up to the level of Mr. Toad’s just yet.  Mr. Toad ends up getting thrown into jail for stealing something that had become his idee fixe.