World of Warcraft in some form? It's kind of been a big deal for the past several years. Having established that you do not already own the game, would you like to pick up the base game plus the first two expansions on the cheap? Even cheaper than their normal prices, that is? Because you have a chance to pick up the whole shebang for just $10 this week.
Normally the World of Warcraft Battle Chest bundle costs $20, but until April 23rd you can pick the whole thing up for half of that. The game also has a free trial you can play if you don't want to take the risk of buying the game without knowing if you'll like it, although at $10 it's almost cheaper to just bite the bullet.