Pan Galactic Gargle Water
Some look at plumbing and ask why? Some look at plumbing and ask why the hell not? Well, the folks at Think Geek have a cool plumbing add on to illuminate your faucet water into a luminous blue color. And the installation sounds easy; any case modder should be able to install it. Plumber's crack optional.
Perfect for washing the taste out of your mouth after reciting Vogon poetry, or putting a splash of something blue in your Pan-Galactic Gargle Blasters after a hard day at work.
Buy one to annoy everyone that has to ask: Why?