While in high school, I made a series of animated (mostly stop motion) movies using a relatively inexpensive digital point-and-shoot still camera that I had taken from my parents.
A fairly complete collection of these movies is available to watch online here.
This is the first one I ever made, shortly after turning seventeen:
My personal favorites are a pair of shorts I made when I was eighteen featuring a Skeletor action figure. In the first, Skeletor dies:
in the second, Skeletor (the action figure) comes to life: