I worked in mental health for 6 very happy years, and we used to say not all the mad ones where on the wards, just visit any supermarket in the rush hour, or drive ona road, there are a lot of undiagnosed mentally ill out there, some are dangerous, and some are just funny and harmless, treat everyone with respect who seems not quite right, because one day it may be you.
We had ex psychie nurses,steelworkers, policemen, DR,s, teachers , senior accountants and lots more, but one thing they had in common, they needed help and a shoulder to cry on, a safe haven from their sometimes minor demons or very serious personality disorders.