Hey, tin whiskers! I haven’t seen this happen in person since my Jerry rigged Celeron 333A killed itself. I’d created a monstrous homebrew cooler with raw bar stock aluminum as an IHS with a big fat peltier cooler and a huge heatsink so I could run the thing at 550mhz. The aluminum eventually grew a tin whisker after the machine had been running in my closet for a good 4 or so years and shorted the Celeron carrier board.
Apparently this was a pretty big problem in aerospace back in the early days, their electronics were particularly prone to this failure mode.