For me, the gateway was via palm pilot careware. My dad had a PDA when I was a kid, and he let me learn how to program it. Then I learned that there were websites to download software for it, and some of that software was "careware", ie pay only if you're able. Something clicked in my head that I could both write and access software without cost being a barrier, and that got me reading about FLOSS philosophy as I entered high school and suddenly I was dual booting ubuntu on the intel iBook I had saved up for and then it was too late for me: FLOSS had me.
VLC to the rescue!