There was an ending (a happy utopian one in a book where most endings were akin to dying in a vacuum) which could not be reached by following the rules of Choose Your Own Adventure books: no other decision in the book pointed to this ending. At the time I considered this a betrayal of the social contract of Choose Your Own Adventure. I was mad! With the benefit of adulthood I've come to accept that this was an in-joke, social commentary of sorts on the consequences of breaking the rules. I still don't think I like it.