1. Mulan- Shan-Yu's forces (Huns) colliding down the mountain pass
As a kid, this scene blew my tiny mind. The silence in the beginning is so haunting and the sense of doom just lingers until the smoke clears and you see Shan-Yu at the top of the mountain. When the drums start beating and the Shan-Yu's men reveal themselves as a force of thousands, it automatically becomes painfully real for the characters and the audience. This scene scared me the most when I was a kid, because watching the bad guys completely engulf Mulan and Shang's army was truly intense.
Fun Fact: 1,000 Huns were drawn specifically for this scene
2. Tarzan- Clayton's death