Same thing goes for showers. Who declared that showers should be performed with hot water? On a side note.. what the hell is this crap about catching cold from not wearing a coat outside in the winter. Last time I checked, colds and other illnesses come from germs, not a certain air temperature.
Perhaps we should start a movement to change some of the widely accepted practices in society, that seem to be followed simply because "that's just what you do". I volunteer to be the Secretary of Defense of our new world.