I was in the building when when a 3F 1200V capacitor, part of a multi-rack mounted capacitor bank, failed. It tore the 20cm mounting bolts out of the floor, launched the three-tonne rack hard enough to crack the ceiling and shattered every window in the facility. I want to say that afterwards I never broke the rule about not being allowed to enter the experiment room until the banks were discharged, but I’d be lying. Undergrads are idiots, and holy cow don’t fuck around with those caps…