I fell off a roof about year ago, I fell 1.5 story's landed half on ladder and half on the concrete. I slipped off the roof tried to stop my self, but I ended up taking the ladder with me and fell off and landed on it. ( started to rain and I was trying to close the roof tiles) I landed on the high point of the ladder on my lower back. Knocked my self out and woke up with my legs feeling sorta funny, In pain all over. Started freak, my mate ran out and checked on us helped me up. Walk away lucky with no broken bones, concusion and damaged spinal ligaments and etc I think I was lucky