Now what was that thing I was going to say to you?

 The man is trying to remember something he needs to say, remembers it and doesn’t say it.

The radio plays, he turns it off, turns it on again, remembers he has just turned it off and turns it off again. 

 Although she knows what he was going to tell her, she insists that he do so, but he doesn’t.

Thoughts after Don de Lillo