Diary of a Madman 1968

Directed by Aleksandr Belinsky

In the main character's diary, he describes his life, his work, and the people around him. He goes on to write about his feelings for a woman, and soon after that he begins to show signs of insanity - he talks to her doggie Meji, he gets hold of letters that Meji wrote to another doggie. After a few days, he's already completely disconnected from reality...