We have a glass shower stall and we use it for cold water discipline. Its great because it causes terrible discomfort without doing any real harm. When my wife needs punishment, I strip her, restrain her wrists usually with zip ties, drag her screaming into the shower and turn on the cold water. More screaming and crying, maybe she'll piss herself. If I feel sorry for her, I'll let her run under the covers when its over. She will sometimes beg for an orgasm to help her warm up.