"Trepanation" is an ancient cross-cultural practice that fashions a hole through the skull. Ancient cultures used this to release evil spirits or as emergency treatment of head wounds. In modern times, obscure subcultures believe that self-trepanation can result heightened states of consciousness...

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I do not understand why people do this, but they do! One lady is actually funding research on self-trepanation for psychological benefit... https://www.vice.com/en/article/bnj4qv/drilling-a-hole-in-your-head-for-a-higher-state-of-consciousness