Video game quotes probably aren't the best way to impress one's girlfriend, but I'm particularly fond of a few Final Fantasy phrases:

Kefka Palazzo, Final Fantasy VI:

"You sound like chapters from a self-help booklet!"

Not very romantic, but memorable nonetheless.

Barret Wallace, Final Fantasy VII:

"There ain't no gettin' offa this train we on!"

A good inspirational and motivational line.

Cid Highwind, in the same game, has a stirring quote about the team's duty to save the planet.

I only started playing FF X-2 yesterday, but the word "disasterrific" is already embedded in my synapses.

There are plenty of other memorable phrases in the numerous Final Fantasy games, but I'l leave those for others to post.