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カナダで生まれ日本で密かに流行した身体改造の一種以下Wikipediaより引用Bagel head is a type of body modification pioneered in Canada and practiced in the Japanese underground scene. It is a temporary (6-to 24-hour) swelling distortion of the forehead created by a saline drip and often shaped to resemble a bagel or doughnut. In 2012, after appearing on a National Geographic TV special, this practice became the subject of sensationalism as news outlets worldwide misleadingly declared it a "Japan trend". https://en.wikipedia.org/wiki/Bagel_head

http://www.nicovideo.jp/watch/sm40283606