Last year, a Russian Researcher was able to develop a USB stick that could instantly destroy sensitive components of a computer as soon as it was plugged in.
But that was only a concept based prototype. Now some guy out of nowhere has actually developed a full scale USB stick that is built upon the work of Dark Purple, the Russian researcher.
This USB is now openly being sold by a Hong Kong based technology manufacturer by the name USB Kill 2.0. It is capable of shutting down any computer within seconds and is being retailed for $49.95.
Read more details http://thehackernews.com/2016/09/usb-kill-computer.html