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Saw a real good confetti storm once in a previous job. They were working on MRI gradient amplifiers (essentially a big honkin audio amp 300V @ 100A) and had a good sized capacitor bank (probably a dozen large caps) sitting on the bench with an insulator and a DVM sitting on top of it. The power source was a 600V/100A supply adjusted to 350V. One day we heard a hissing sound and someone yelled "DUCK". Apparently the power supply lost regulation and put out full voltage whatever that was. Big confetti storm and the DVM (an HP bench job) was thrown through the ceiling.
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