Ever since the opening of New Fantasyland, the last part of the ride's queue has been great fun. Upon entering Toad Hall and encountering the foreshadowing tapestry, you hear jolly music -- and a distinct CRASHING sound which repeats every fifteen seconds or so.
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.

