Pretty much any space-related documentaries. Rosetta probe's trajectory alone is one heck of a motivation.
However it's also beneficial to have a dollop of reality on top of Iron Man fantasies. I think that docs like Indie Game and Startup.com must be on the first year CS cirriculum and a required viewing after Social Network. For many, it would help setting expectations a bit more straight.
I see what you're saying, and will check them out, but I would argue setting expectations straight would be demotivational. As long as you know a given idea is not delusional, I think there might be a benefit in keeping your expectations unmanaged, something psychological that says the more you entertain the idea of things going wrong, the more likely they are to. I may be wrong but I intuitively feel like success for a given goal is to a large extent about being stubborn and headstrong in the pursuit of it.
However it's also beneficial to have a dollop of reality on top of Iron Man fantasies. I think that docs like Indie Game and Startup.com must be on the first year CS cirriculum and a required viewing after Social Network. For many, it would help setting expectations a bit more straight.