This stack overflow question has some more nice examples: http://stackoverflow.com/questions/7220436/good-examples-of-not-a-functor-functor-applicative-monad ht

This stack overflow question has some more nice examples: http://stackoverflow.com/questions/7220436/good-examples-of-not-a-functor-functor-applicative-monad http://stackoverflow.com/questions/7220436/good-examples-of-...