Psychosis, when people lose touch with reality, is not a rare occurrence -- as many as three in 100 people will experience it at some point during their lives. Psychosis typically includes hallucinations, which consist of seeing, hearing or feeling things that are not actually there. A common example is hearing voices. It can also include delusions, which are beliefs that are not likely to be true and that seem irrational or nonsensical to other people. A typical example involves believing th...