This is in the UK, where we drive on the left.
We were stopped at T-Junction waiting to turn right (crossing over lane).
Parked on the lane into which we were turning was a car, parked facing the traffic.
Just as we pulled out, the parked car pulled out of its spot and performed a u turn.
So we manouvered, by turning right and they manouvered by starting contraflow and executing u-turn.
We actually did not collide, but I was curious as to who would've been liable.
I think the video will explain the scenario better –