Many of the extreme body modifications people can have done are permanent procedures. Others are temporary. Body sculpting is apparently big in Japan, with a new fad called "bageling", or "bagel head" is growing in popularity. Is this a procedure you would consider? Take a look at these photos, then decide.
This procedure was pioneered by Canadian body modification artist Jerome Abramovitch, so the process is actually native to Canada. It has found a home in Japan, however, and its popularity is growing. Not original to the island and growing rapidly because of no natural predators. Doesn't that make it an invasive species?