A friend of mine named Lucy is going to build and sell lighted dog leashes.
Basically, the leash will combine an LED flashlight that is essentially one of those "shake" lights, and as you walk with the dog on the leash, the movement of your arms will charge a capacitor and power the light.
So that you can see what you need to see after the dog does its's business...
Anyway...she needs an amusing name for it...
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