Shake it to light it — no batteries needed.

The is kinda interesting. Also you can say you have a Hummer, and that for only $29.99.

Description:
All the rugged Hummer® flashlight ever needs is a quick 30-second shaking to generate power for up to five full minutes of bright illumination. Inspired and licensed by GM's intrepid Hummer, this shockproof, rubber-guarded, waterproof and floatable flashlight is ideal for outdoor use and perfect for every vehicle or home emergency kit. Its LED bulb never needs replacing and there are no batteries to worry about.
Faraday's Law of Induction explains how the relative motion of the built-in magnet sliding between metal coils charges the light's capacitor.
For prolonged use, just shake for an additional 10 seconds every three minutes. Rugged translucent plastic housing measures 8" long.
Weighs 8 oz.
Get the Hummer Flashlight at Sharper Image Store