When I had a 27 Catalina I climbed to the cabin top to remove the ties from the main. I was so intent on doing this in a timely manner that I completely forgot I had not closed the hatch. I dropped through the hatch, fell 7 feet, hit the side of the salon bunk, broke two ribs, then motored back to the marina. My wife drove me to the emergency room, they took some X-rays, sent me home and told me to take it easy for a while. Needed some heavy medications for this one, though. The pain was pretty intense the following days.