The Twirl 'n' Hurl is basically like the Dumbo ride at Disneyland, with the addition of sarcastic commentary, Theremin music, and an added element of targets along the sides that utter Simpsony phrases if you can maneuver your vehicle at just the right height when you pass them.
Sadly, there are no plans for Treehouse of Horror tie-ins to Halloween Horror Nights. Maybe next year.
Full ride-through of the Twirl 'n' Hurl and its various soundbites after the jump. If you plan on going to Universal Orlando any time soon, I'd say don't spoil yourself - but if, like me, you live on the other coast, enjoy it vicariously.