Nice one!
I was filling my tank in the van up with water a few months back, I use a transfer pump from my static, and, I got distracted doing another job!!!
I got the lightbulb idea, hit me like a hammer, realised I'd forgotten about the water. Footwells had a decent 6-7" and back of van was swimming too. So I stopped the flow, chucked out the pipe and drove up an incline just round the corner with doors open. Left it for a bit. What a proper turnip.
Lessons learnt. I don't do anything involving while I'm waiting for the water to fill.