Acting is not that far from mental disease: An actor works on splitting his character into others. It is like a kind of schizophrenia.

Vittorio Gassman (Italian pronunciation: [vit’to:rjo ‘gazman]; born Gassmann; 1 September 1922 – 29 June 2000), popularly known as Il Mattatore, was an Italian actor, director, and screenwriter.
He is considered one of the greatest Italian actors, whose career includes both important productions as well as dozens of divertissements.