The worst pain is what? Stepping on a Lego brick, of course! Think about doing that over 100m, because that's what Gabrielle Wall of New Zealand did.
Gabrielle just got a new Guinness World Record for the Fastest Time Running Over 100m of Lego Bricks. She did the painful dash, while barefoot, in 24.75 seconds. That sounds horrible and I think that this is a record that probably won't be broken because who in the hell would want to endure that?! It's madness!!!!