In my case at the time I ws working as a sysadmin for a company that owned a few shopping centers and grocery stores, of various sizes. In one of them, seemingly randomly, in the morning we would find that no records were processed and trasmitted during the night and thus thay had to be generated manually.
So, one day I decided to take my car, drive about 300Kms from my office and stay overnight to see if there was something strange to report. So, after the closing time I was sitting there with a cup of coffe in my hand, just like the guy in the comic strip. I actually thought I was alone there but it turned up that I wasn't: there was, imagine that, the butcher still in the store. He saw me and he went like "OK, I'm going home, are you going to turn the power off tonight?" I initially thought he was talking about the light but I asked him what did he mean with that.
It turned out that, as there only were a bunch of employees in the store, there was a schedule of who was in charge of the end-of-day activities, something I and my colleagues in the office did not know. And we were very lucky: it also turned out that the butcher at the end of the day used to switch the lights off by cutting off the power of the entire store! (including fridges, air conditioning and... the server and the router).
Of course I told him not to do that anymore and to tell his colleagues to do the same (it turned out that he was the only one to do that, that's why I said that I was very lucky to stay in the store overnight the exact day that the butcher was also there).
Needless to say, we never had that morning problem again.
