I saw WICKED in December 2003. I believe it had only been open for two months, since Halloween. This is directly after all the rave reviews and hype, before the huge teenage fanbase derived.
A huge standing ovation was given after the Act I Finale, "Defying Gravity." Though, it did not stop the show, since an intermission followed.
However, the show was stopped briefly later in Act II. Idina Menzel just finished "No Good Deed." A couple of people in the middle of the Orchestra section stood up and applauded loudly, just a tad more audible than what the audience's applause level. This prompted other random people throughout the Orchestra to stand. I turned around to see other small random section of standing patrons. Menzel was breathing heavily, smiled, and the show went on, forcing the audience to sit. But those brief 30 seconds seemed like an eternity.
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I also remember during the revival of INTO THE WOODS, the cow "Milky White" did something rather humerous, and the laughter in the audience would not stop. The cow then
milked all he could get, adding more motion.
"The Spectacle has, indeed, an emotional attraction of its own, but, of all the parts, it is the least artistic, and connected least with the art of poetry. For the power of Tragedy, we may be sure, is felt even apart from representation and actors. Besides, the production of spectacular effects depends more on the art of the stage machinist than on that of the poet."
--Aristotle