I was flipping through a Carolina Biological catalog (we homeschooled, Carolina Biological is basically the supplier for educational things that are in any way related to biology), and I found a section about a new fish they had for sale- Glofish. Convinced parents to get them for me, set up a 10g, and promptly lost 5 of 6 fish to lousy advice (namely, no cycle). Realized I was doing something wrong, went on a research trip, found out what I was doing wrong, and kinda just went from there.
It's been something like 9 years, and I now have about 180 gallons of water in my room. Also, I am currently on my way to becoming a marine biologist, and I'm conducting a personal research project into the species and numbers present in a river near our house. I kinda got REALLY hooked.