There were no protesters to be found outside NYC’s Eugene O’Neill Theatre on 49th St. yesterday evening. Ordinarily, that information wouldn’t be news, but last night wasn’t quite an ordinary occasion: It was the first preview performance of The Book of Mormon, the new musical by South Park creators Trey Parker and Matt Stone and Avenue Q co-creator Robert Lopez. (Check out EW’s Q&A with them in this week’s issue.) An irreverent tuner about two Mormon missionaries in poverty-stricken Uganda, Mormon has been touted as the most potentially obscene production to ever grace the Great White Way. So just how off-color is it? Very. The show is jam-packed with foul language, sexually explicit jokes, and enough blasphemy to knock your church-going grandma right out of her seat.