IBM's Watson can do everything from assisting doctors in making medical diagnoses to helping guests at Hilton hotels as Connie the robot.

And one of its more interesting skills is its ability to read humans better than humans themselves. One of the supercomputer's 30 APIs is its ability to analyze written text and assess personality traits based on the popular Big Five test, which rates subjects for extroversion, agreeableness, conscientiousness, neuroticism, and openness to experience. It can also identify different tones such as fear, joy, confidence, and openness.

Vinith Misra, a research staff member for IBM Watson, already had Watson analyze the "Harry Potter" and "Star Wars" universes. Here's what it had to say about the "Lord of the Rings" universe: