On Shower Pens.

Someone should invent a shower pen — a water unsoluable marker that allows you to write on bathtub walls and shower glass without rinsing the ink away. When the shower is over, you can either take a picture of your thoughts with a camera, or lift the ink with a special type of paper. Ink washes off with shower spray that cleans your shower at the same time. Good ideas. Good hygiene. Clean showers.