Keep in mind that at one point, someone had to have used it instinctively in order for them to even consider using it actively. Someone got mad and said, "DO WHAT I SAY!", and the person did it, which lead to doing it without being so angry, and so on.
People do things like this all the time. Some are just talented and can perform actions instinctively, but get better as they work on how to bring it out at will.