Yes, but which would win: Tifa's left or Tifa's right?
Here are some things I thought of:
Seven best challenges (either self-imposed, like a White Mage Only game in the original Final Fantasy, or built in to the game, like getting the Excalibur II in Final Fantasy IX)
Seven worst storylines / plot devices (I expect FFVIII would feature at least twice, with memory loss and time compression)
Seven most powerful game-breakers (e.g. getting the Zodiac Spear as early as possible in Final Fantasy XII)
Seven most memorable enemies (from Final Fantasy VII, probably)
Seven best minigames/sidequests
I like Avec's idea of the seven best FMVs as well.