Post a series that u find has an ambiguous ending

Let's see... there's two that come to mind. Oh, and mini rant warning, por the way.

1. The Legend of Legendary Heroes. They. just. stopped. No warning, nothing. The series just up and quit RIGHT AFTER THE PLOT TWIST. They won't continue it, and now all the fãs have got are the light novels to go off of because, wouldn't ya know, there's no manga! So yay eternal cliffhangers.

2. *drumroll* KIBA! YAY! But I'm serious, it wasn't an ending. The creators were just like, "Let's try to be symbolic and confuse the living crap out of our audience! PROFIT!" I still have no clue if Zed and Noa ever got back to the same realm. I mean, it was implied, but the ending was just like, "Hah, no, you get too keep guessing~" Ugh. I would keep going, but that actually sums it up rather nicely. *bows out*