Naruto evidently...I still remember it like it was yesterday (which it wasn't)
If you care, which you most likely won't, it was when my oldest sister was flipping through channels and stopped on Naruto, airing the 3rd episode on Cartoon Network. my brother and I saw it and we really liked it, we've continued from there afterwards, moving from the anime, to the manga. (evidently, my oldest sister hates anime, even though she was the one who found it.)