That happened to a neighbour of mine a few years ago. I could hear running water for a while and thought he was hosing his path, it was when I saw water pouring out of the overflow in the roof that I realised that something was up. Both of my neighbours were away and so I had to find the neighbour that was looking after their house. When we went inside water was pouring through the downstairs ceiling. We went to the fire station where his friend worked and they came out to sort things out, apparently they can be called out in that situation as it is a safety issue .
Reminds me of the time when my sister was 2 years old. We were away from home staying in a cottage in the lake district and it had been a very bad drive there. Then I had had to walk to the bottom of the track, strip off my waterproof and all my warm layers and immerse my arm shoulder deep into a pit of water (middle of the night thing under torch light) to turn the water supply on. Go back 1 mile up track now freezing cold and put my brother and sister to bed after making them. Light fire and wait for life to warm up. Fire always needed supervising when wind from a certain direction. Typical lakes weather outside...
My sister comes down complaining that it's raining indoors. What? Go back to bed. She can't talk properly yet, too young. Hour later we repeat only it's her sitting on the stairs... She takes herself back to bed after threats of death. It's now past midnight, no sign of parents and I'm expected to wait up for them.
Half an hour later I hear her crying on the stairs. It's raining in the bedroom.... The ceiling's raining. It's raining onto the bed. I'm warmer by this stage, my best friend is now fast asleep.... So I relent and call her down... She's soaked and it's not her usual bed wetting. And I mean soaked. I grab a towel, strip her down in front of the fire.... Blanket and go upstairs to see what's going on. Sure enough it's definitely raining on the bed from a 2 year olds point of view. It's dripping out of the ceiling and raining on the bed!
The only thing up there in the roof above it (we know this cottage very well) is the header tank for the hot water system heated by the open fire, and bare slates. A fault somewhere on the system meant that the cold water in the header tank was now boiling since I had lit the fire, condensing on the cold slates and dripping through the ceiling onto the bed...
It was definitively raining in the bedroom.
Only a 2 year olds logic and language skills would come up with that one.
We laugh now but then....
