When I was in grade school, at least one teacher made a point of introducing us to Roald Dahl (Charlie and the Chocolate Factory) and Shel Silverstein (Where the Sidewalk Ends). Morality tales with creepy and icky ends not only appeal to many young kids, but can be a way to discourage people from actual creepy, icky, antisocial behavior.

I'm over 40 now, though.