Like Catcher in the Rye, Huck Finn involves a boy whose inner self is in conflict with what the adult world expects from him.
Write about a time when your own ideas, beliefs or convictions were in conflict with what was expected from you or considered acceptable. What have you done about it? Another way of approaching this would be to write about what element (s) of "normal," "acceptable" adult life is troubling to you.
Just an FYI: The Common Application for college asks a version of this question in its list of college essay topics.
