There is only one word that describes this guy: hero. I'm imagine one of two scenarios. Either he didn't have a date for the prom, which is probably more common than people think. Or his prom date got sick and couldn't go. Either way, this guy went with a choice and it was the right one. I love my game system too, dude. I totally get it.
It's a hilarious joke, and by doing this he's pretty much made it impossible to make fun of him for it. He owned up to his love of his XBox 360 so much that what else is there to say? The only problem I see is that he had to lug that thing around for the entire prom. Then again, if you love something there is no sacrifice too great.