Leaping into a hot shower of a mornin' is invigorating, refreshing, warming, all sorts of things. What you don't want it to be is freezing. Now of course you could just use your hand to test the temperature of the water - but where's the fun in that? This ludicrous gizmo incorporates a temperature sensitive light source, so not only can you shower in streams of light (which is well cool in the dark by the way), but the light changes according to the temperature of the water. The red/blue thing is of course fairly redundant in that we're all grown-ups now and can probably tell if the water is cold or hot, but showering in light is just irresistible. Daft and definitely un-missable.