Just write them down...or try to anyway, if you're a softie
Off the top of my head:
- "Up" - the opening scenes featuring the old man (I've forgotten his name) and his wife...really knocked me sideways.

- "Eternal Sunshine of the Spotless Mind" - the final memory Joel has of Clementine in the beach house, and they have to say goodbye.
- "Milk" - the final scene, the tribute candlelit march for the titular character.
- "The Green Mile" - Coffey's execution (and asking that he doesn't get hooded, as he's afraid of the dark)
- "Goodbye Lenin!" - the final scene with the rocket.