Yes, I've had rear wheel aquaplaning twice this year. It happens very quickly (usually when driving in a straight line) and there's very little that you can do to correct it. You're just a passenger really as the rear end slides to one side. I would go as far as to say that driving the M3W when there's a risk of standing water on the roads should be avoided at all times. I certainly have a new-found awareness and respect for very wet conditions.
