MegaMan NT Warrior....lol. Ended up getting obsessed with it. My brother and I would both pretend like we thought it was dumb, but then one day my brother was imitating a commercial and was like "wanna watch MegaMan" me: "yeah" *is sheepish*. Yeaaah, so ended up loving that one, and never expecting it to happen either!
The majority of animes I'm really into, ie Chrono Crusade, Nagi no Asukara: are ones I found randomly while searching for something to watch xD.