Monkey with a screwdriver.
About twenty five years ago, the test technician in charge of testing OEM[1] parts returned by our corporate customers was busted for recommending perfectly good, but badly configured (by the customer) parts to the scrap heap. His buddy, in turn, bought the "scrap" for pennies on the dollar (or less ... ). I figured his scam out when he scrapped a perfectly good Sun 3/260 ... I had borrowed the power-supply, legally (all paperwork done), out of MRB [2] to test one of my test boxen that had gone tits-up. The silly twit hadn't noticed that it was in MRB simply because it was supposed to have 16 megs of RAM, not 8 megs.
We documented similar thefts for a week or so, and called in the cops. They got a warrant, and searched his house ... finding over 1.5 million US$ in perfectly good hardware. He was arrested, and released on his own recognition a couple days later, pending trial.
A couple days later, he wandered onto our campus "after hours", calmly ::snipped:: the ground wire to the 400amp service providing power to the building he had worked out of, opened the electrical panel, removed the safety panel, used an insulated screwdriver to loosen the neutral wire from the bus, and linesman's pliers to pull the neutral, instantly sending 240 Volts through any 120V kit that was plugged in and powered up. Killed coffee pots, microwaves, fridges, radios on desks, lights, desktop computers ... and the security cameras. He's lucky he didn't burn the place down. Fortunately, the VCR tape containing the video was undamaged.
He didn't know that I had fixed the security cameras that he had disabled (probably, I don't know for a fact, but he smirked at the camera above the service panel ...).
He did roughly $325,000 damage in a couple seconds. And 2 years inside, with 5 years probation. He never worked in the high-tech world again, to the best of my knowledge.
[1] "Original Equipment Manufacturer" ... kit built by other corporations that we configured & resold alongside our own home-built kit.
[2] "Manufacturing Review Board" ... anything that shipped had to go through Manufacturing for final QA, even if we didn't build it. If it b0rked in the field, Manufacturing was in charge of figuring out why bad gear made it out into the field with our name on it.