Demi Lovato's latest teaser for her 'Heart Attack' video is the most mysterious yet.

The 15-second clip at first just appears to be a dark abyss, but then a figure -- who we're guessing is the lovely Lovato -- rises up from a pool of black something (paint, tar, goo?). It's eerie and even a bit macabre. In previous clips we saw Lovato with black paint on her hands and a 'Blue Steel' style Derek Zoolander glare, so whatever happens in the full video is anyone's guess.

Luckily, we'll find out later today (April 9)!