Not that I disagree with all that has been listed, but I would add:
1. Khan quoting Moby Dick before activating Genesis in Twok
2. Picard's "They invade our space, and we fall back
. They assimilate entire worlds, and we fall back
. Not again. The line must be drawn here! This far
and no further
!" speech from FC
3. Excelsior attempting to catch Enterprise, breaking down, then displaying "Good Morning, Captain," from TSFS
4. Kirk shooting the Gorn captain with a bamboo cannon. ~TOS
5. Any scene depicting the Defiant leading a Federation Armada against the Dominion in DS9
6. The self destruction of the Enterprise in TSFS.
7. The first appearance of the refit Enterprise-D in All good things, with the third nacelle.