Not exactly the kind of ring you buy at a jewelers

On November 3, 2007 Moviesign made a Forge map in Halo® 3, and set up what his girlfriend of over two years (furtive penguin) thought was going to be a two-on-two match with his friends. They started the game and Moviesign led furtive penguin to a spot where he claimed he'd put an energy sword.

Instead there was a nice top-down view where he had spelled out a proposal in weapons. He then asked her to be his teammate for life.