Think Shutter Island. No, I'm just kidding. I'm a habilitation counselor for people with mental illness. It's actually quite fun and the guys I work with are quite pleasant 95% of the time. Yesterday, in a house near where I work though, the counselors had to mental hygiene someone and when the police came the client lifted one of them into the air and threw him to the ground, knocking him unconscious, then he broke another officer's leg when they tried to restrain him.
They definitely keep you on your toes. One day, a guy could be the jokester of the house, the next day if you ask him "why did the chicken cross the road?" he might think that you just said you were going to kill his mother.