Rape, anal penetration with foreign objects, amputations of male/female genitals, deprivation of sensory and sleep, the application of electroshocks to the most sensitive parts of the human body, beatings (either with fists or objects, pipes, belts or batons), finger and toenail extractions, acid burns, electroshocks and stabbings with blades and razors, ethnic cleansing, war…

After a certain length of time has passed, things harden up. Like cement hardening in a bucket.