Have you ever seen or heard a coke and meth'd out person rambling at a mile a minute?
You take slow Joe, who is naturally in a state slightly above catatonic, juice him up with the best Pfizer can make and you get a somewhat normal person, who slurs and says stupid stuff.
There is no doubt he's getting a cocktail of drugs when he's going in front of a camera for a big event. No normal human whose regular state is mumbly and incoherent, just switches on like that.
IMO, Ecstacy