As you near the boarding area, you see the source of the noise as you watch the departing motorcars disappear through library doors -- only to immediately crash back out through the room's fireplace.
The effect (done with scrim, animation and fiber optic embers scattering across the floor) is a hoot to watch -- but it's not quite what the Imagineers tried to achieve in 1983.
Going through my old photos, I remembered I'd taken a shot of the original fireplace effect.
Peter Pan's Flight simultaneously attempted a similar effect with a climatic mist waterfall for the pirate ships to fly through...but -- again -- all most guests saw was a faint trickle of mist.
As a fan, I hoped the mist machines could be perfected, but both mist effects were soon removed from the rides and replaced with scrim, which allowed the fire and water projections to be seen more clearly.
Today, the bursting fireplace effect looks and sounds better than ever, with a great sizzling sound effect as fiber-optic embers scatter before the little motorcars.
And, of course, the Imagineers never gave up on the mist projections. Today Disneyland guests encounter creepy mist rats in the Indiana Jones Adventure, and both Disneyland and Walt Disney World host the amazing waterfall illusion on Pirates of the Caribbean.
It seems you can't keep a good idea down any more than you can keep a rich, eccentric toad from getting his hands on a motorcar.