The clip Norman's psychotic profile from Psycho (1960) with Simon Oakland. Powered by: Anyclip. any moment from any film.
To understand it the way I understood it, hearing it from the "mother" that is from the "mother" half of Norman's mind you have to go back ten years to the time when Norman murdered his mother and her lover.
He was already dangerously disturbed, had been since his father died.
His mother was a clinging, demanding woman, and for years the two of them lived as if there was no one else in the world.
Then she met a man, and it seemed to Norman that she threw him over for this man.
That pushed him over the line and he killed them both.
Matricide is probably the most unbearable crime of all, most unbearable to the son who commits it.
So he had to erase the crime, at least in his own mind.
He stole her corpse.
A weighted coffin was buried.
He hid the body in the fruit cellar, even treated it to keep it as well as it would keep.
And that still wasn't enough.
She was there... but she was a corpse.
So he began to think and speak for her, give her half his life, so to speak.
At times he could be both personalities, carry on conversations.