Just on the news during Ed Milliband's speech when he said the war in Iraq was wrong.
David sits through speech stony faced, conference claps, most of front bench don't, except Harriet Harmon. David snaps turns to her and says "What are you clapping for, you voted for it?" Alistair Darlings face behind is a peach. Unfortunately Harmon was just out of shot.
I'll try and find a clip.