Where It Came From: Tokyo, Japan
...BUT WHY? It's a new way to give society a huge middle finger.

The "Bagel Head" body modification process consists of a controlled injection of saline into the forehead, and then making a manual indentation in the middle with the finger. The result is... decidedly not normal. Tracing its roots back to 1999 at a Toronto body modification convention called Modcon, it was Ryoichi "Keroppy" Maeda who claims to have brought it to Japan in 2003.