People will think of anything to try and make a buck. Here is a story that details the 10 worst inventions in history. The wig for cats is especially strange as is the prankster fire alarm trap.
Have you ever thought of an invention that you think other people would appreciate? I know that I have, but none come to mind right now. Of course, since I am currently grading research papers, I would like a device that could numb my brain to the frustration of realizing how little my students listen and follow directions.