Theory 1: The government wants us to be smarter, so it puts nanoparticles of genius in the water. Drinking it won't suffice; you have to be covered in it. Hence, when you take a shower, the genius particles bombard you and you have strokes of genius. This one isn't very likely.
Theory 2: The Lack Of Distractions. Usually, there's so much stuff to pay attention to. iPods, the Internet, TV, people, notebooks, interesting wall hangings, the sky, and on and on and on. But in the shower, there is not much to look at. I mean, really. Tiles. Soap. Shampoo bottles (which don't make for very interesting reading, trust me). Your own body, which isn't very interesting. So you're basically forced to THINK, and turn all that attention inward, which is BAM when inspiration hits.
Theory 3: Autopilot and the Art of Zen. Ok, so I admittedly don't know much about zen, but here's what I do know: When you "zen out" (which is probably not what it's called) you just do something without thinking about it. In this case, that something is showering, soaping, shampooing, etc. You're used to doing these things, so you don't have to think about them, leaving your mind free to wander and stumble upon ideas and such.
Theory 4: Clothes make you stupid. I don't know how or why, but they do; when you're naked in the shower, you're brain is free to think good thoughts.
So. There you have it. Four reasons, some serious, some not, about why ideas strike in the shower. Believe whichever you will.
