"Straight down", I'd like to see how you handle "Straight down" please.
A straight down fall I experienced was falling off of a roof. I was completely parallel to the ground the whole way down and landed flat on my back on a dirt/rocky surface and both of my sides got scraped a bit because I landed between two stakes (they were up around the garage since it was in the process of being built). I think that qualifies for a straight down fall..... it scared the crap out of me after the fact, but I was perfectly fine because I was relaxed, exhaled up landing and I tucked my chin so I didn't whack my head on anything. I do not have video of this though..... I wasn't even sore the next day.
I also did a flying face fall off of a lawn mower going about 20-25 mph (long story) and although it wasn't straight down, I would still put this in the same category. I got pretty dirty from bailing, but over all I was alright. THIS did make me a bit sore the next day, but what do you expect? Could have been a lot worse if I didn't go with it. My biggest worry at the time was getting away from the tumbling mass of metal that was chasing after me as it rolled, so the impending impact was the least of my worries. Again... no video. Sorry.