Against this view it is urged that we underestimate the automatic powers of the normal subject. We are told that many of the acts which we usually do quite consciously might really be done without consciousness. In support of this assertion such facts are pointed out, as men completely undressing without knowing it, when their attention is distracted by other matters.

—Leon Solomons and Gertrude Stein, "Normal Motor Automatism" (1896)

Yes, you know how it is when that happens. (By the way, Solomons did the write-up.)