dude, i don't want to disappoint you but I've never watched any other video from this guy! LOL!
but i will now take some time to watch some of his videos for sure, the first that i will start with is this that you mentioned: "gudjohndaneil"
but hey, this is natural of "acting" while videos like that are being casting :/ there is famous guy here that earned a award from google! this guy owned, his name is: Caue Moura. But don't waste your time by searching about this brazilian guy, he only speaks in portuguese, i t guess you don't speak portuguese :/
As far as I know it just keeps a log of everything people type into the chat box and feeds that back to other users.
So let's say you ask: "What's your name?" The program will repeat that sentence to another user and repeat the answer it gets to you. That's why if you ask if it's a robot it will tell you it's human.
I have to believe these over-reactors use some kind of bot to inflate sub numbers. I refuse to believe so many people think that's funny/entertaining. Then again, somehow shows like big bang theory and movies like jack ass are huge.