It was a bit of a shock the first time it happened. I was sitting at my desk when a man's voice echoed round the apartment. Nobody had entered and the TV was off. The disembodied voice was emerging from a previously unnoticed and nondescript grill by the entrance, and it transpired to be telling us not to use the water for a while because there was a problem with the plumbing, the mundaneness of which finally ruled out any kind of demonic possession.
These apartment block announcements from janitors have become a regular feature of life here, telling the captive audience of one problem or another. All well and good perhaps, but we seemed to cope well enough when we had an apartment without an internal public address system. I suppose this must be the slightly unnerving consequence of living in a really large apartment block.