I have a lot, so.....
Toy Story--Woody's pleading with the Frankenstein-toys in Sid's room to help him save Buzz.
Blade 2--Nyssa's disintegration as the sun comes up, after fifteen-plus minutes of slick ultraviolence.
Fellowship of the Ring--The whole Amon Hen sequence, from Aragorn facing down the hundred orcs, through that amazing rolling-down-the-side of the hill shot that takes us from one fight to another, to the fall of Boromir.
Return of the King--Two. One is the bit at the beginning, where we see Gollum's slow degeneration as the Ring corrupts him. Also, the moment when the Mumakil turn up, visible from the other side of the battlefield....
and the Rohirrim charge them!
Hard Boiled--the entire hospital shootout.
Kill Bill--the entire battle at the club. Especially the way the last standing gang member is dealt with.
Apollo 13--the tense wait to see if the spacecraft has burnt up, missed and shot beyond hope of recovery, or if it made it. I knew what had happened, but I was still on the edge of my seat.
Matrix Reloaded--Morpheus' speech. "What if tomorrow.....the war could be over?"
Matrix Revolutions--Three. The start of the battle for Zion, where all the mecha open fire on the breach at once, and there's nothing coming down from it but wreckage for several seconds. The hovercraft shoots above the cloud cover, and for just a moment, we see a normal sun and sky. And shortly afterwards, Trinity's death scene. Neo may be a god in the virtual world, but in the real one, he's helpless--he can't even see her face.
Conan The Barbarian--the conversation between Saboutai and the wizard at the funeral pyre. "He is Conan. A Cimmerian. He will not cry. So I cry for him."
American Pie--"This one time, at band camp....."
