Back in the days of ghetto watercooling, running a KT7A Socket A + Tbird Axia? I think? Just spent over £60 on having a Little River White Water waterblock shipped over from Australia. As well a a Dangerden Maze 2 for mt Geforce 2 GTS, btw I cannpt remember if those exactly were the specs.
I had a 15litre reservoir next to my pc with an eheim 1250 mains powered pump (this thing could push a lot of water very quickly) i was using an Aopen HX08 server tower and the side panel was off to allow for tubing.
I had just installed the LRWW without crushing the core, i had the return loop to the gfx card/reservoir fitted and all clamped down with some good quality metal jubilee clips.
Awesome! Time to pwer her up, flicked the switch on the surge protector to power the pump and the big metal 120mm 240v papst fan on the heatercore
**** **** ****
As I realise that the outlet tubing from the pump was not connected to my waterblock and was hanging inside the PC, with the eheim eager to pump litres of water infused with urine smelling antifreeze (to stop corrosion due to mix of aluminium/copper - which didnt work in the end)
The water went everywhere even onto the surge protector. I managed to get to the switch and flicked it to off, phew, safe at last ... it shorted out and fired up the pump again lol this time I went for the wall socket and managed to finally power down the pump.
Well lots of sponging later and a few hours of hairdrier action and overnight in a warm place, everything fired up the next day fine, nothing had died

I guess because the PC wasn't on at the time. Even got some water into the Enermax PSU.