Gamasutra - A Theory About Humor In Games.
Consider the laughter that occurs in a friendly game of Scrabble or Spin the Bottle. The chuckles that occur are just as honest as those that come about when listening to a stand-up comic, but the means of creating the insights are different. Game are unique in their ability to set up systematic, repeatable opportunities to create and confront mental models. Specifically in multiplayer games, the rules of the game often deliberately encourage players to create their own time, place and group specific jokes.

truepcgaming - Steampocalypse 2011: The Rise and Fall of a Coal Addict.
Valve: I give up. You win. I lost. I’m done with this. I’m putting your coal and your achievements and your sale away. I’m just gonna go play fun games that I want to play now. Thanks for keeping me from doing that for past two weeks of my life.