Forte the Pipe Organ is rather creepy, mostly due to his empty eyes and him being animated in CG. That, and being voiced by Tim Curry.
Compounding the empty eye problem was the camera always panning really, really close to his face. When that empty-eyed face takes up the whole screen, it's very, very unnerving.
Everything about him is eerie. From his ability to casually destroy the castle, to the fact that he will die if his bolts come loose from the wall, to...everything about him.
The climax where he tries to destroy the castle was pretty intense, especially with everyone being in danger of being crushed—including Forte himself. Also, his green musical notes had a nightmarish look to them as they hit the Beast and how he went Laughing Mad as he is going through a Villainous Breakdown. Not to mention that Forte was even apparently willing to endanger his own life to ensure that the spell remained intact, making his breakdown horrifically similar to a suicide attempt.
Fife: Maestro, stop! What do you think you're doing?!
Forte: Don't you see, Fife? They can't fall in love if they're dead!
His death was unsettling, with Beast personally killing him by ripping his keyboard out and smashing it, prompting Forte to finally unbolt himself from the wall and collapse to the ground face first. Imagine what that would have looked like when the spell was broken. Not to mention the clanging noise when he hits the ground indicating the equivalent of a tall person falling down and breaking their neck.
His human form (seen in a flashback) is rather sinister as well. With eerily pale skin and a face almost similar to a vampire!
As if the flashback scene where we get to see the prince get turned into the Beast isn't bad enough, the Enchantress's true form manages to be both a stunningly beautiful and terrifying bit of animation (her cold face and empty eyes are the kickers), only aided by Kath Soucie's wonderful voice work.
The idea of actually seeing the Prince physically transform into the Beast was one of the late Howard Ashman's original ideas for the original film, which was rejected. Perhaps it would've been better not to reinstate that detail even if Howard had originally wanted it (unlike the reinsertion of the song "Human Again").
The scene on the frozen lake:
Fife whistles loudly, startling Phillipe into breaking the ice and separating him from the sleigh and its occupants.
Chip falls into the water and is unable to swim, forcing Belle to dive in after him. She manages to grab him, but needs the others to break a hole in the ice for her to breathe.
Belle gets dragged back under the ice by the rope caught on the tree and falls unconscious, which is the closest she's ever come to actually dying. She narrowly avoids drowning when the Beast arrives to save her.
Although he saves her, the Beast is still extremely angry, and nearly steps on Chip as he stomps away carrying Belle.
