Major Lazer just released a new music video for their song Bubble Butt and it has some butt expansion at the front of it. It's bizarre (it's from Eric Warheim of Tim and Eric fame, so yeah) but kind of nifty.
https://www.youtube.com/watch?featur...&v=hR-NXv5Tma0
I say just, but this is actually a few months old.