I knew nothing about this show going in, except that two people I knew saw it and loved it.
The Book of Mormon.
FREAKING hilarious. Best production I have seen in ages, pretty much loved every second.
I saw it at the Fisher Theatre in Detroit with my season tickets, and I read online that every show has sold out for it's 10 day appearance. I am sure you can get tickets on Ticketmaster, through the Fisher ticket exchange, eBay or Stubhub.
If you like musicals and comedy and are not easily offended, SEE THIS SHOW.