IamA skydiving instructor, been in the sport for 10+ years and almost seen it all AMA!
I started "skydiving" after going through military freefall school in Pau (France) in 2003 (I already had my static line rating.) Stopped logging non-working jumps after around 1000 jumps (work jumps are what counts to keep my instructional ratings current.)
Skydiving is one of the, if not the sport offering the most diverse disciplines and is a lot of fun... if you are not being stupid. Freefall couldn't be more different from what people imagine, so i thought this might be an interesting topic for people not having experienced it before (we call them whuffos in certain situations).
My Proof: https://vimeo.com/72519172 (Link to a video on my vimeo account showing actual skydiving instructional jumps - note the user name here and on vimeo.)