Unless you mean because it's spelled the same way backward and forward. Is that what you meant? What do they call it? A...
8 seconds sound clip from the Desk Set (1957) movie soundboard.
You can hear this line at 00:33:10 in the Blu-ray version of the movie.
Quote context
[...]
- No, no, don't worry about me. I never get cold.
- Now, do you notice anything unusual about the following sentence?
- Um, no.
- But... I doubt that Napoleon ever said anything like that.
- Mmm. I know another: Madam, I'm Adam.
- I doubt if he ever said that.
- Yeah.
[...]