One day, about five (I think) years ago, I got a brainfart of an idea (which is still blowing around in things I do).... and did a google-search for "free 3D animation software". It brought me to anim8or.com .
I saw this pic...
(http://www.anim8or.com/gallery/gallery16/new_frontier.jpg)
...and this one...
(http://www.anim8or.com/gallery/gallery12/napalmchickarmed.jpg)
...and decided I wanted to learn 3D stuff... Though I've been slow to take it all on, and am still a long way from anywhere in particular, I've been messing about with anim8or (mostly anim8or) for 3D stuff ever since.