Accidental chemically induced insanity."

The sort of induced insanity he had lived with as an IRU cyborg was very effective for military purposes over the short run, allowing a single cyborg to serve an assortment of functions and to travel interstellar distances alone without breaking down mentally or emotionally.

Philosophers Aristotle and Pliny the Elder argued that the full moon induced insanity in susceptible individuals, believing that the brain, which is mostly water, must be affected by the Moon and its power over the tides, but the Moon's gravity is too slight to affect any single person.