So I stumbled upon this just now. It's quite unusual, I don't think I've ever seen a belly piercing like this. I guess it's a dermal type piercing. Does anyone have any information about it, I couldn't find much about it online.
http://www.youtube.com/watch?v=ZJBm4g3wNFM
Picture here: http://www.imagebam.com/image/5cb832191977542
EDIT: Sorta unrelated, but I found this and thought it was nice.
Credits, Berserker.