Those that know me, know that I am full of ideas.
However, they also know that only about 0.001% of them are actually good ones.
My hair brained schemes are largely greeted with a polite smile or a
Here are two of the more recent ones...
Number 1. A moisture sensor on the roof of your car or somewhere near the front windshield, that automatically adjusts the speed of your windshield wipers, I just hate that squeaky sound

, and more practically one can never react quick enough when the downpour hits or when passing a semi.
Number 2 and I think this one might be more doable (pun intended). I call it Shake, Rattle, and Roll. A battery-less vibrator that is powered like those small flashlights that you shake up.
http://www.survivalschool.com/products/lighting/
Just shake...rattle...and ROLL!

It is already built to fit into a cock shaped vibrator too, so it wouldn't take much to incorporate the two technologies.