I like the moment in "The Most Toys" right before Fajo enters the room where Data is being held captive. Data is studying the Mona Lisa and attempting (rather unsuccessfully) to emulate her smile.
I also like that part in the episode about the people trying to sell rights to the stable wormhole, when Data and Geordi are about to enter the wormhole to test it out. Geordi says something about not liking the idea of being stuck in there forever, and Data says "There is a bright side, Geordi. You will have me to talk to."
And the end of the episode introducing Barclay, where he says "Computer, erase all programs under Barclay .......................Except program number 9." (And the rest of that episode )
And the end of "Yesterday's Enterprise": "Geordi....tell me about...Tasha Yar."
And, of course:
PICARD: Didn't any of you play with ships in bottles when you were boys?
WORF: I did not play with toys!
DATA: I was never a boy.
And basically every other moment in TNG.
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"No man is an island, entire of itself; every man is a piece of the continent, a part of the main. If a clod be washed away by the sea, Europe is the less...any man's death diminishes me, because I am involved in mankind..."