Recently in GregTech:
I was in the process of upgrading my very compact cluster of machines to the MV tier. I placed another one and immediately wanted to configure it. Unfortunately, two mechanics conspired against me: GT machines take a few seconds after they've been placed before they can be interacted with, and I was too early - and Inventory Tweaks automatically pushes another item of the same id group (no idea where those are defined, but all GT machines share one group) into your hands if you place the last one of a stack. So, what I now did was not "interact with new machine" but "place another machine randomly selected from those in my inventory". As my luck would have it, that was one of the LV machines I had just dismantled, and an MV cable just happened to be next to the block space where I placed it....
...BOOM! The concentration of power around the wrongly-placed machine was high, and the explostion destroyed everything in a 6-block radius, including about 20 machines I had spent half a real-time day crafting.