The Subtle Safety Defensive Ring looks like a simple innocuous ring. Only it's not a totally innocent piece of jewelry. It can unfold into three linked rings that can be worn across the fist like brass knuckles. I think I would be way too terrified to wear it.

Via Margarita.

Speaking about frightening defensive devices... A woman in South Africa has patented a "rat trap". This tampon-sized device, designed for a woman to insert, attaches itself to a rapist and has to be surgically removed. Anti-rape campaigners in South Africa are outraged about the new invention but its inventor, Sonette Ehlers ,insists she does not hate men: "Something needs to be done, and women are crying out for me to go ahead."

Ms Ehlers expects the device to go on sale next month.

From Technovelgy < BBC news.