I stayed in a relative’s house while no one else lived there and forgot to turn off the water in the bathroom sink one day.
I was trying to handwash something and got distracted.
When I heard a strange dripping sound, I looked in the bathroom and saw water everywhere on the floor.
I cleaned it up but then discovered it had leaked through the floor into the basement.
I cleaned up the water on that floor and wiped off the plywood ceiling.
After a week or so I had to glue down some of the floor tiles that had come loose in the basement.
The ceiling ended up with some water stains on the plywood but it already had some stains elsewhere so I was hoping no one would ever notice a few more.
I never told the relative what had happened.