A foot operated pointing device.
 

Everyone should have one... but unfortunately not one of mine.

I went through the tedious process of making a prototype, make the patent application, contacted companies like Microsoft, IBM and Logitech. After two years of waiting I finally got a notice from the patent office, stating that my invention has  already been invented by another guy. A Japanese dentist....

Well, I did learn a lot about the procedures in making a patent  application, which will be put to good use in other projects.