Igor isn't impolite. He simply can't talk.
5 seconds sound clip from the House of Wax (1953) movie soundboard.
You can hear this line at 01:03:56 in the Blu-ray version of the movie.
Quote context
[...]
- So you did come to see me, my Marie Antoinette? Or was it that you came to see?
- Mr. Jarrod, I'm so sorry. I know I'm not supposed to touch the figures.
- But you couldn't help yourself. Don't let it trouble you.
- Oh, I beg your pardon, this is Leon Averill and Igor.
- Igor isn't impolite. He simply can't talk.
- Leon is an artist in his own right.
- It was he who did the waxwork on the figure of Joan of Arc.
- Does she still seem real to you?
- Of course, her hair is different, but that doesn't change her face.
- What puzzles me is how you can get such detail from a photo.
[...]