The Black Cauldron/Nightmare Fuel

• The Big Bad, the Horned King, is all by himself one of the most horrific Disney villains, being a skull-faced, brown-robed nightmare with horns and the menacing voice of John Hurt. But then you add the warrior skeletons reanimated by the Black Cauldron, the Cauldron Born, who lurch out of the cauldron, attacking anyone in the way. They shamble inexorably from the Horned King's castle to slaughter all in their path, and boy, do they not skimp on the slaughter and death in this movie. It ended up needing several cuts to avoid an R rating, and that still left in some of the blood.
• When Gurgi was going to jump into the cauldron.
• To quote website Topless Robot, here's two of the scenes that Disney cut out of the movie:

In one of these missing shots, an undead warrior spawned by the title cauldron gorily slices through an unsuspecting villager. In the other, one of the villain's more disposable henchmen gets a dose of cauldron-born mist and dissolves quite messily.

• A rare animation cel that depicts the latter scene can be viewed here.