When I read this letter, I saw your signature, I thought somebody was playing a joke on me.

5 seconds sound clip from the House of Wax (1953) movie soundboard.

You can hear this line at 00:38:41 in the Blu-ray version of the movie.

Quote context

[...]

- This is Igor. He's a deaf-mute. He's one of my assistants.

- I'm going to open another wax museum under a different name.

- It startled you, eh, seeing me here?

- That's an understatement. I thought you were dead.

- Jarrod is dead. I am a reincarnation.

- When I read this letter, I saw your signature, I thought somebody was playing a joke on me.

- I still don't understand how you escaped from the fire.

- It's a mystery to me, too.

- All I can remember is that I tried to get out of my studio. I failed at first, but here I am.

- What a frightful experience.

- Somehow I made my way to the house of a doctor.

[...]