The best mmo games do their best to immerse their players into a virtual world of fantasy and magic. There's usually a compelling storyline that features the player as the catalyst for saving the world by stopping some ancient evil or by uniting multiple factions. While these narratives can be quite enjoyable, they do tend to be pretty serious and can get pretty grim from time to time. It's like always being forced to live in Gotham, fighting the never-ending forces of crime alongside Batman. Where's the fun or the whimsy that can crop up in real life? That's why it's so great to see a wild or crazy event pop up in-game.