The following video was created by the Real-life Reinforcement Learning group at Rutgers University and, in my opinion, it demonstrates why reinforcement learning is awesome! Using RL, artificial intelligent agents such as the AIBO shown in the video can learn solutions to problems that a human engineer may not consider herself. Sometimes the solutions are very creative such as the one found by the AIBO in the video below.
The video won the award for Best Short at the first AAAI video awards last summer.
If you want to learn more about Reinforcement Learning, then take a look at the introductory RL book by Richard Sutton which is available for free online here.