As he struck, he kept on screaming at his brother one word over and over.

9 seconds sound clip from the The Pit and the Pendulum (1961) movie soundboard.

You can hear this line at 00:28:41 in the Blu-ray version of the movie.

Quote context

[...]

- Nicholas could see that both our mother and our uncle were uneasy, frightened.

- Our father's smiling affability as he described the workings of these hellish instruments turned Nicholas' blood cold.

- He watched them with a mounting sense of premonition.

- Something was wrong, most terribly wrong. Even he, no more than 10 years of age, could sense it like a darkening vapor in the air.

- There was no reason for our mother and our uncle to have been there.

- As he struck, he kept on screaming at his brother one word over and over.

- Adulterer! Adulterer!

- And then he turned on her... accusing her of vile debauchery with his brother, cursing her as faithless, promising her the agonies of hell in payment for her infidelity.

- And there, before my brother's very eyes, our mother was tortured to death.

- Ever since then, Nicholas has been unable to live as other men. Always he is haunted by the memory of that terrible day.

[...]