I noticed on a couple of blogposts yesterday (Lib Con and Hadleigh Roberts) that they were drawing attention to the fact that when Nick Clegg made his now infamous statement about how Jack Straw had supported "the illegal invasion of Iraq", George Osborne appeared to know what he was saying before he said it as he was lip-syncing along with him.
This actually makes more sense than Clegg and Osborne having colluded on this. Osborne voted for the Iraq war and also does not consider it illegal. Why would he want Clegg to say that? It just puts him and his colleagues in an embarrassing position. And if there was collusion you would expect Osborne to do everything in his power to suppress any urge to mouth the words as Clegg said them. As for the pointing at Straw and laughing as soon as Clegg sat down, well that's what happens at PMQs. I do not think we need read anything much into it.
So in this case I think that all Osborne's lips betrayed were intense concentration and a slight nervous tic rather than some conspiracy.