I was watching a video on the new update 14w06a then at the end of the video he crouched and I saw a problem with his Minecon 2013 cape. He was in F5 #2 so not a lot of people could see the problem.. So I went on one of my singeplayer worlds and see if it did the same thing with my cape "I do have a Minecon 2013 cape" and it was doing the same thing.. The cape moves p in your head when you crouch and when you fly when you are crouched it acts like the same cape but its shoved in your head.