Quote from Adrian Monk in Mr. Monk Goes to Group Therapy
Adrian Monk: I think Barbara was murdered too. Rhonda: You said "think." You're telling me you're not sure? Adrian Monk: I think someone, for some reason, is killing this group off, one by one. Dr. Bell: What do the police say? Adrian Monk: They're looking into it. They'll probably want to talk to each of us. Rhonda: Why? What, you th- They think it's one of us? Adrian Monk: It's possible. Harold Krenshaw: One of us? Adrian Monk: It's possible. There is a possibility that one of you is not quite sane.