Things that excite, inspire and impassion me:

Positive:

3D Modeling & Animation
Artificial Intelligence
Augmented Reality
Computers
Family
Human Behavior
Human Mind
Parenting
Programming
Reading & Writing Books
Relationships
Religion
Robotics
Social Behavior
Society
Spirituality
Technology
Video Production

Negative:

Abuse (women and children)
Irresponsible Men
Politics
World News & News Coverage (in general)

Specific Examples:

I got excited about a story dealing with a recently discovered tribe that has had no contact with the outside world.

I got excited and wrote a letter to friends of mine who were having relationship problems.

I got excited and wrote a response to a random person's blog entry outlining their spiritual questions and how lost they felt.

I got excited about writing an entry (for my "thing") about the programs and hardware I would need to produce my own nearly professional grade video and movies.  The discussion of such products is stimulating.