Here's a couple of photos from last Sunday. Wanda Beach, small mushing surf, 18-20 knots out of the south-east. Myles kept us entertained.
^^ That, I believe, is the "Oh Sh!t moment," just before the stack itself. It's that point in time where your brain informs you that you are about to experience a whole heap of pain.
The stack hasn't happened, but it's in the post...