The witness can't possibly testify as to what 478 other men would say.
7 seconds sound clip from the A Few Good Men movie soundboard.
You can hear this line at 01:34:03 in the Blu-ray version of the movie.
Quote context
[...]
- But you did order the barracks restriction, didn't you? You did order the denial of food?
- Wouldn't this form of discipline be considered a Code Red?
- No. (5)
- If I called the other 478 Marines at Guantanamo Bay to testify, would they consider it a Code Red?
- The witness can't possibly testify as to what 478 other men would say.
- The government's objection is sustained...
[...]