Naruto, sadly.
I watched kid animes like Pokemon, Digimon, ZOIDS, Medabots, DBZ, Yu-Gi-Oh, Beyblade, etc and while I knew they weren't American, I didn't know the exact term for anime mostly due to my young age. Naruto aired on Toonami and I was hooked. Since I was old enough and had internet access, I stumbled upon the world of anime and started from there with other big names like OP and Bleach. Now I'm a huge otaku. =P