Someone in Russia has created a new USB known as the USB Killer 2.0. and it will completely destroy your device.
Once plugged into a computer or laptop, the converter chargers the caps to -220V, then fires the voltage right back into the computer through the USB signal wires. The process then repeats until either the processor or USB port is fried.
So if you ever have to borrow someone’s USB stick, make sure that it’s someone that you know and trust…