That's not much of a backflip, dude. Missing the balance beam, landing and crushing your nuts in the process isn't a really good attempt. If people are able to make a car do a backflip, you can do a lot better than that.

This had to be staged. Hear that laughter (before the dude's moaning wails)? Unless they are entirely sadistic, no human could stand there and laugh after someone they knew just crushed their nuts on the balance beam like that. At the very least, you'd ask them if they were ok.