Another one would be Grievous dying, but thats another story...
I actually did feel sorry for Grievous in that part.
Quite a few scenes come to mind:ANH
- When Luke goes back in his landspeeder to his aunt and uncle, but finds burning and blackend skeletons instead. You can see the look on his face in this scene.ESB
- When Vader says to Luke "No, I am your father". That is a class scene.ROTJ
- After the emperor is thrown down the pit/shaft, the scene that always brings a tear to my eye is the part when Luke drags Darth Vader's/Anakin's dying body over to the ramp of the imperial shuttle and lays him down, takes of his helmet and his mask, and Luke says "I've got to save you", Anakin replies "You already have, tell your sister your where right about me, you where right". That is a very sad scene.