Proving once again that you can do a lot of damage with a little investment and a lot of ingenuity, security researcher Samy Kamkar recently managed to take down a locked, password-protected computer armed with only a $5 Raspberry Pi. The low-tech cookie-siphoning intrusion is one of Kamkar's simplest hacks ever. He previously has unlocked car doors, garages, wireless remote cameras and other devices, with MacGyver-like precision. Kamkar's latest hack, PoisonTap, uses a Raspberry Pi Zero, a micro SD card, and a micro USB cable.