back when i was sailing my old cherub.
down in rockingham was screamin into the bottom mark fairly tight and we went down this wave and did a really sudden and violent nosedive/cartwheel where i got slammed into the bottom of the sidestay. had purple/black bruising all down the side of my torso, covered an area maybe 2 foot long. that was with the protection of 4mm wetty and a pfd. so was pretty violent! haha