my old civic actually did exactly the same thing that happened in the video.
I was rounding a bend on oph in similar rainy conditions when the tail slowly slowly edged out, and the car didnt react to any of my steering or throttle inputs until it was too late.
I didn't make the swedish scream of death since it was a fairly low speed accident but it was still baffling to me how it all happened.
Prior to that day, I had absolute faith in the adjustability of cars on the limit- even though the civic sucked in this aspect.
Nowadays, I realise random 'oh crap' moments DO happen in the rain.
and yes, that is an absolutely hilarious clip whilst being very scary at the same time.
That being said, wet trackdays on good roadtyres are an absolute classic! much better than wet oph nights.
Langers I would be much more scared of random retards on public roads than idiots on the track.