I'm not saying it's the only possibility but, to me, a display like this: screams "I took a benzodiazepine, probable Xanax and probably in too high a dose, before taking the stage." Somebody once described benzodiazepines as "alcohol in a pill". In the video, to me, Perry looks like somebody who is very intoxicated but is trying to act sober. What else do benzodiazepines do? They cause confusion. They can interfere with short-term memory.
As the video above confirms, I'm far from alone in wondering if Perry was "drunk or stoned". If I were inclined to give money to his campaign, despite the "high on life" reassurances of his campaign staff, I would want to see a blood screen. As Jon Stewart put it,
Best-case scenario, that dude's hammered. Worst-case scenario, that is Perry sober, and every time we've seen him previously, he's been hammered.I don't want to dump on the man. It's easy to laugh. But by all appearances the man needs help and in my impressions are correct those who keep pushing him on stage aren't much different from this guy.
My campaign song suggestion ("Rehab") was pretty pointed, but one might infer that his staff prefers "Comfortably Numb".