Well, many insane people and seriously mentally ill people seem very reasonable.

I've always been interested in obsessive, insane people.

The history of saints is mainly the history of insane people.

I will meet you in the next three days. In the name of God Almighty, I proclaim the end of the world in this century. All the world will be destroyed, every human being will die. I am not God, I am not son of God, I am Christ eternal.

am i insane" asked alice
"yes, but all the best people are" replied her father

...I see more pathology in others than I did ten years ago - the older I get, the more insane people seem...