Rubber Ducky
https://hakshop.com/products/usb-rubber-ducky-deluxe https://github.com/hak5darren/USB-Rubber-Ducky/wiki
The USB rubber ducky acts as a HID (keyboard) which naturally allows you to input keystrokes into a computer. Plenty of scripts on the github page allows commands to be run super fast. Will not work if computer is locked.
PoisonTap
Works even if computer is locked. (evil)
PoisonTap produces a cascading effect by exploiting the existing trust in various mechanisms of a machine and network, including USB/Thunderbolt, DHCP, DNS, and HTTP, to produce a snowball effect of information exfiltration, network access and installation of semi-permanent backdoors.