And sometimes you miss that when you only hear the monologue that passes as a dialogue when each side is talking to each other through the press.

WHITEHOUSE: Press Briefing

During signed dialogue we hear nothing but a trickling fountain in the background, or the sounds of distant crowds.

NEWYORKER: Seen but Not Heard

Also, they could check to make sure that all of the lines of the play were said correctly, because you want to see and hear the play you are paying for, rather than some variation created by incorrectly remembered dialogue.

FORBES: The Problem With No Child Left Behind -- II