Mr Puntila suffers from a dual personality. When drunk he is human and humane; when'sober he is surly and self-centred. In the former condition he proposes to Eva to marry his own loyal and sardonic friend, his chauffeur Matti. When he'sobers up he throws Eva out and abuses Matti. However, after putting Eva's suitability to the test, and having had enough of Puntila's instability, Matti leaves him, saying 'water and oil can never blend.'