I watched it in horror.... then realised ds was watching it too! We explained much the same way as GR explained to his kids, that they were fed lots of good food to make them fat so we could eat them for Christmas dinner.
But then he asked if it was sore. DH and I both said NO, they just get zapped and thats it. Then he asked "But if it isn't sore why did they scream when they were zapped". We just said that was the Zapper that made the noise not the Turkeys.
I am a meat eater... and I'm not normally squeamish.... BUT MY GOD!!!