While trying to record Usain Bolt after his 200m win in Beijing, a cameraman riding a segway ran into a separate camera track which sent the segway spinning off in the opposite direction - taking out both the cameraman and Usain Bolt. Usain gets up and walks it off, but if he ends up being seriously injured and unable to race - we wouldn't want to be that cameraman.
Update: he's okay.
“It didn’t actually hit me in my Achilles, it hit me in my calf area,” Bolt said. “It’s alright, I will get over it. Never a doubt [for the relays], never a doubt. I am just going to get it massaged, ice it up a bit and I should be fine.”