Lunatic is not a commonly used (or PC) phrase anymore. It was once used to describe those mentally ill. Some famous people who have suffered from mental illnesses are:
- Ludwig van Beethoven - Bipolar disorder
- Jim Carrey - depression
- Kurt Cobain - ADD and bipolar disorder
- Charles Dickens - depression
- Ernest Hemingway - depression
- Janet Jackson - depression
- Heath Ledger - insomnia, drug abuse, and depression
- Abraham Lincoln - depression and anxiety
- Isaac Newton - depression
- J.K. Rowling - depression
As you can see, often the most creative and intelligent people suffer from mental illnesses.