air gear after i found out they canceled the show. but as for the anime itself probably oban star racers i teared up a little at the end of that series. getting attached to a series is both a blessing and a curse in that way.
Let's see; right now I am watching Clannad with my older sister (this is her second viewing of it, whilist this is my first). Got done with ep. 9 earlier and I was tearing. However, the only anime I do remember actually crying at was episode 23 of Fate/Zero (not saying why!).