There are some people at my barn who turn out their horses in the arena with the saddle on, with the horses head tied to the saddle so that his head is pulled to one side. Some of them do it gently so the horse's nose just points to one side, some do it drastically so the horses nose is pointed at the girth. After the horse has been out like this for a while they hop on and ride. The whole thing looks pretty uncomfortable to me, especially when they have the horses head really cranked to one side.
What is this called and what is it's purpose?