Re: "I think he did a little too much LDS"
Well, at that point -- which I interpret as Dave Bowman's persona having been uploaded into the simulation spaces of the monolith -- or pretty much any other point in the movie actually, it's not like some guy in the audience going apeshit was going to cause anybody to miss some important dialogue. I wondered if he was some sort of performance artist of the piss variety.
"Sans le canard de Vaucanson vous n'auriez rien qui fit ressouvenir de la gloire de la France." -- Voltaire -- Flip flap!