It really did happen. Her and jimmy did a reenactment of the scene with him saving the day. The original video didn't have jimmy. It was whoever that opened the door and her on fire.
No.. it was staged. The viral portion cut just before Jimmy comes in with the extinguisher. That's how they explained it on the show. They admitted it was staged ... as a fun prank to play on the web.
Looks like the tables have turned from hilarious in its own right to laughing at the public spectacle of these things. You have to give credit where it's due.