'Hamilton'
The moment: There are several options, but director Thomas Kail thinks it's "The Room Where It Happens."
Where to see it: Orpheum Theatre, through Oct. 7.
Why it stops the show: Kail says it's "Hamilton's" equivalent of "Rockin' the Boat." The big build from the chorus and the gospel-like fervor of Burr's delivery ("I've got to be, I've got to be in the room where it happens") send this Act 2 number over the top.
'The God of Carnage'
The moment: A woman, part of two couples who spend the whole drama bickering, suddenly starts projectile vomiting.
Where to see it: Lyric Arts, starting Oct. 3.
Why it stops the show: It's a spectacular effect — one that has put props directors across the country to the test — and it comes out of nowhere.
'Mary Poppins'
The moment: "Step in Time."
Where to see it: Artistry, starting Oct. 6.