There are some renovations happening two floors above my office. Due to miscommunication /misinterpretation of orders (pro-tip: when somebody tells you not to do something, DON'T DO IT), a 500 L tank decided to empty itself into my office ceiling on Saturday, resulting in water raining down on mine and my colleagues desks. Onto our bookshelves, onto our computers.
Even though I wasn't there at the time, from what I heard the first responders acted quickly and effectively. Boards were lain across books to protect them, computers and peripherals shifted as far as possible out of direct harm, and power cables unplugged (from the computers, without touching wall sockets). But there was a lot of water, and some damage was unavoidable.
I found out about this on Saturday at 2pm. I rushed to my office, but by the time I arrived most of the water had been mopped up, and a dehumidifier placed in the centre of the room. I tried to dry the worst damaged books, looked for any damage at my colleagues desks, and took a lot of photos for insurance purposes. I was hoping that my computer and external hard-drive would be ok, as they weren't turned on when they got wet, and therefore shouldn't have short-circuited. But I had to wait til Monday for electricians to properly assess the damage.