Lol, I beat you to it. Post 11. :P
To nitpick, you didn't indicate a dialogue reference there yet - in terms of the scene itself, the "sonic shower" could have been like a "perscan belt buckle", a cool backstage idea that never was verified on screen. Mr. Laser Beam
was the first to nail it down as an actual dialogue mention.
(Okay, background noise mention, but still.)