Here comes Nate carrying the cake (Helen and Jing worked pretty hard to make it with their help), and Mike following behind with an oddly shaped item.

There's me beginning to blow out the candles.

The oddly shaped item turned out to be a tree. It was Mike, Andy, and Nate's present. They were pretty proud of its weirdness, but it actually does a fine job of making the room look a little more habitable.

Me, beginning to cut the cake. As you can see, Helen and Jing went to quite a bit of effort to spell out Happy Birthday David.