11. Laser Bike Lane
Another invention for the selfish. Or for those just wanted that you’re the only one to use a certain mug? This invention is for you. So, how this mug functions?
It has a little plug that fits perfectly into a small hole in the lower side of the cup. If you put it away in the cabinet, you can hide or bring with you the little plug. When someone gets it and uses it, the water will be spilled through the small hole. Now, no one will steal your favorite mug again.