The mother-in-law's basement flooded the other day. By the time I arrive there's 5+ feet of water down there. Get pumps going and after many hours the waters are receding and I can see a stream of water gushing up in the the location of the sump pump. Turns out one of the rubber fittings that hold the back flow valve had let go...so no water was exiting the house.
Here's where things get really weird. The receptacle where the sump pump was plugged in had been under water for 8+ hours, yet the pump is still running. Maybe not the brightest idea but I walk up and pull the plug. The battery back-up kicks in! The battery is sitting in one of those plastic trays on the floor and is filled with water. So I pull the wire off the battery and the damned charging unit, which was also sitting on the floor (under 5' of water for 8 hours) starts BEEPING.
How the heck does that happen? I would have thought the water would have shorted everything out and at least tripped a breaker... Not to mention the electronics in the charging unit.