At the game store, there was a hole in the office wall right into the foundation of the building, three guesses what happened with a heavy rain- or snowfall. Quite a few times I had come in to see a good portion of our shipping supplies ruined...each time, I moved the dry stuff into the downstairs back hall area, a day later it was moved back before all the water had been cleaned up 
I wasn't there the day this happened, but one of the toilet pipes developed a leak, which sprayed half the office every time the toilet was flushed and it took half a day (why so damn long?) for someone to find the mess. We lost a few hundred dollars of ebay stock with that one; of course I wasn't notified of the issue and nothing was done to help dry everything off (water penetrated the shrinkwrap and was ignored; I was basically expected to ship damaged goods).

I wasn't there the day this happened, but one of the toilet pipes developed a leak, which sprayed half the office every time the toilet was flushed and it took half a day (why so damn long?) for someone to find the mess. We lost a few hundred dollars of ebay stock with that one; of course I wasn't notified of the issue and nothing was done to help dry everything off (water penetrated the shrinkwrap and was ignored; I was basically expected to ship damaged goods).
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