Essentially anything that challenges, or makes me want to go out and do something, I would say is inspiring. A good example is when I watched The King of Kong.
The documentary really made me want to go out and get a Donkey Kong machine, get good at it, and possibly beat the high scores achieved in the movie.
Literally, I did just that. It took a lot of hard work and effort, but I got inspired and set a goal and stuck to it.
Thanks for posting, enjoy your Sunday.