It couldn't have been going on for too long before I got up, because it was just a puddle in the laundry room and some soggy carpet in the hallway. That could have been much, much worse.
Another first... I had my first house fire about 6 months ago (lol). It finally got all fixed up in Dec, and when we moved back in I had my two cats locked up in the upstairs bathroom for a few days (I don't remember why). The 2nd or 3rd night back in our house I woke up to the sound of water... Apparently one of the cats climbed into the bathroom sink, pushed the stopper down with her fat butt, and somehow turned the water faucet on high.
That incident flooded two bedrooms, the downstairs bathroom, laundry room, and wrecked a bunch of drywall. Ended up costing us about $1k and 3 days with industrial heaters on downstairs.
I guess the cats didn't appreciate their accommodations.