I love to watch so many different things spanning across virtually every genre. One thing that I really enjoy watching, as random as it may seem, are Batman cartoons/animated movies.
For being considered children's show, the animated Batman shows and movies are quite mature. They contain very dark and adult related themes. They often see their main characters asking important questions regarding ethics and morality.
Many times Batman is faced with a seemingly impossible situation against a foe of his. During several of those encounters Batman is faced with the option of killing his opponent. However, it is Batman (Bruce Wayne's) belief that killing his opponents would in turn make him just like the criminals he has sworn to fight against.
The criminals Batman faces are most often psychologically deranged and confused. They have been through certain traumatic events in their early lives that have led them to their current state.
Batman, the arsenal of justice, fights these criminals in unparalled style and precision. He is regarded as the best detective in the comic universe and is by far my favorite superhero.
I highly recommend checking out the animated series as well as the feature length animated movies he is featured in. They more recent movies are more adult oriented, hardly for children, and they always entertain.