Addendum to Yesterday

I was thinking today about a problem I had with the kindergarten class. I was trying to do a turn and talk. It failed miserably. No one would talk. I asked why and what was going on and they said they didn't know what to talk about. I said I could prompt them again and there were several times that I explained and simplified etc. Only one pair would talk and every one else stared and laughed at them for doing that. I'm not sure how to better execute this...