stay away from it. >> but about halfway through our stay at indiana, josh harrison stepped right intoble. during a shakedown of his dormitory, officers found a nine-inch knife hidden among his possessions. harrison said he was considering using it on another inmate, one who was convicted of killing his cousin. >> he's going to try to come with his little dumb story, you can believe that. oh, they was going to do something and he knows i'm not going to let no one do nothing to him, so that would be weak to me. in his heart he's got to prove that he's tough. he's probably like me. he feels a lot of pain, but he's covering it up by trying to show violence, that's all that is. >> when robert found out that josh had been caught with a knife, he wanted to talk to him before josh went into lockup. so, you know, we were filming, we were following robert up there and i'm expecting, you know, the nice father/son kind of chat. and robert just lit into him. >> you think it's funny, don't you? you're a straight idiot. what you go get the knife for, for real? why did you get it? >> to do it on my c