Help, I need a good invention!

Arrgh! I'm in dire need of help right now people. I'm as bored as all heck and have to invent something. Preferably something that has not been done yet, is useful, and easy to build a prototype of. Anyone who gives me an idea of what to build will be entitled to %10 of my royalties and an honest partnerner for life (or something to that extent). I'm thinkin' about a type of engine/motor, new lighting systems, efficency in fuels, a new type of media storage, ANYTHING! Help me out guys or I swear I'll blow a gasket (Ooo, maybe a new gasket for cars) .......

Ok Mr Humble here is you one.

A sniffer for automobiles. They have a gadget that you blow into before the car will start for alchoholics but not all cars have them just the the ones that have been convicted of DUI so many times and then they have to have them installed before they are allowed to drive. They blow into it and if under the blood alcohol content then the engine will start.
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But like I said only a very few have them installed.

Here is how the sniffer works. Standard equipment on all autos and trucks. You get into the car and if it smells any alcohol at all the engine will not start. Even the smell of a bottle of beer open in the car. No start. No more drinking and driving.

Now get to work.

Hmm, a noble idea but how would it know it is your breath? and what if it smells your drunk friend next to you? Why wouldn't you roll down a window if it *were* you?