I was in 6th grade and wanted to know more about computers. I thought being a computer programmer would be a cool job one day. I'd heard Linux was difficult to install and use and thought hey, that'll help me learn. So I had my parents get me a copy of Mandrake 6. It was perfect because I had the free time to play with it and figure stuff out by making mistakes and fixing them without the pressure of having to do really important work.
I do preach the good word of FOSS, but only to those who are in a position to appreciate the suggestion and benefit from it.