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I once encountered a European set that had some sort of bridge rectifier arrangement that guaranteed the chassis was hot no matter which way the plug was inserted (wish I could recall the details). I had it on the bench at Zenith to do some comparison of video output circuits, and got fireworks when I first connected the scope probe ground, so reversed things and got fireworks again!
We also once had a workbench moved that mistakenly got wired backwards -oops! All communicatins with the electrician were through the building manager, so I don't know if he got a reprimand. Once bitten, twice shy, so ever after, I checked any new wiring myself before using a bench.
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