When you build a character and you want him to reflect, think and go through a process of emotions. As in life, obstacles are what show us our true condition, the most interesting the obstacle and how the character can overcome it will create an impactful sense of achievement. Examples like There will be blood, Vikings, Splash are interesting. I liked the video because if you have seen the movies before, you are taken to those moments with the character and remember very clearly why they were feeling and driven to take those decisions.