An iconic moment: David Luiz looking at Carlo Ancelotti and mouthing "Who? Me?!!" after his mistake allowed Chicharito Hernandez a clear path to goal. The Mexican striker needed no second invitation. It took just 36 seconds and Old Trafford was rocking.
Nemanja Vidic inflicted further damage when he cleverly held back and at the right moment came from behind Ashley Cole to head Ryan Giggs corner perfectly.
Chelsea should have been down to ten men in the 38th minute when Branislav Ivanovic cynically fouled Wayne Rooney, his second bookable offence. But Howard Webb took a very, very lenient view.
45+ minutes left, two goals down and Chelsea have a mountain to climb. They finished the first half with an improved display but it will take a miracle to win. A draw will serve no purpose.
Man Utd again show the heart of champions. Sir Alex is winning the tactical battle against Carlo Ancelotti. It is amazing to see how their players line up so quickly in favourable positions to counterattack. A buzzsaw of activity.