Orchestra shock
The moment when a soloist first plays a piece with a full orchestra and has his/her mind blown by the incredible sound. Usually accompanying symptoms include soiling of pants in response to said sound.
Guy 1: Hey what's wrong with Bill?
Guy 2: He just finished playing a piano concerto with an orchestra and he's still recovering from orchestra shock.
Guy 2: He just finished playing a piano concerto with an orchestra and he's still recovering from orchestra shock.