"They keep putting this blanket on me. Why do they keep putting this blanket on me?" "You could be in shock." "I'm not in shock." *figures out John killed the guy* "Don't listen to anything I just said. I'm in shock. See, I have a blanket.
The thing that most american sherlockians don't realize is, in England "trousers" are "pants", and "pants" are "underwear". John isn't talking about Sherlock's pants he's talking about his underwear. One of my favorite scenes.
Sherlock: the way his mind works is so ingenious! a man who can understand everything about a crime but can not grasp the concept of human interactions and social graces. I love it! <<story of my life.