Console(s): Xbox

If there's one game that absolutely everyone roaming around your hall will have played or heard of, it's Halo, and why play on Xbox Live when you could just get into a few rough and tumble deathmatches with your neighbors instead? Grabbing a buddy and going apeshit on a Warthog is a surprisingly effective way to make a new best friend for life. All those bitter players that you guys took down? Well, hey, you don't need to be hanging out with losers anyway.