The Dark Knight contains several fantasies of teenagers who like to imagine themselves with superpowers, or at the very least, having more power than they have now at whatever stage of life they are in (junior high, high school etc). Instead of constantly being under the strict thumb of their parents, teens often like to fantasize that they are in full control of their lives and can emulate screen characters like Batman and the Joker.

Unfortunately, neither of these major characters have any relevance to real life, and so, while they are fun to watch for a few hours, they really do not have any adult content. This is why most adults find these types of films amusing, but not very meaningful. And it is also why young children and teens find the films interesting; because it provides them an escape from their humdrum lives. Just as you have films that have adult content that is not recommended for children, you also have films the have childish content that are not recommended for adults. This is one of those films.