This is the part in the special features were the actors speak about their characters and what it was like working on the Green Mile set with the other actors.
It's a pretty good dubbed over version of that scene (maybe it was made for it) the onlt difference is that everyone is Welsh and the dialogue is funnier.
"Now i got your attention! Watch me jump! I jumping! I jumping i am! Everybody watch me jump!
It's basically saying, what if the guards (all the guards except for Percy) were the evil and sadistic ones. It's pretty funny even if what they were doing was not.