I hack Super Mario World into a new game to ask my girl friend to marry me.
I proposed with this video, and she said yes, so I must've done something right! I took her to a karaoke club (where I had set things up in advance) and we sang in a private room for a little while. Then, while she went out to grab us a couple of drinks, I cued this video up and hit play when she came back. And the rest is history!