Definitely Sweeney Todd's God That's Good. You get sent out into intermission with the tease of Try The Priest, where finally, halfway through the show, the main conceit - the thing you came to see - is finally put in play. When you return from intermission, you're immediately presented with an unhinged cannibal orgy that builds to a sensational choral peak, at which point the audience climaxes and is then soothed by the Johanna quartet. It's a flawless use of the intermission format.