Automatic Nail Clipper
My idea is to have an Automatic Nail Clipper/Cutter. The user should only have to insert the upper portion of his/her finger into this device. This device senses the extra grown up area of the nail and clips/cuts it gently.
Additionally this device should have a filer as well so that after the Nail has been cut, it can be smoothened as well.
Reward: A good digital camera.