One of my friends sent me a pointer to this rather interesting coffee cup from designer Efrat Gommeh. It's a coffee cup with a twist: it has a hole that can only be filled by a special locking "key." This effectively prevents other people from using your coffee cup.

It's an interesting idea, but fortunately, it doesn't seem to be for sale anywhere. I can only imagine the product liability lawsuits stemming from this product. The lawyers would have a field day with this.