Wii fighter Tatsunoko Vs. Capcom is packed with tons of inside jokes, including plenty I don't quite get.
Take for instance this little "game" that you can play while watching the credits roll by after beating the game. You can control the speed of the trio of bikers (the Dorombo Gang, Fahey thinks) and tap a button to jump. That's it. Though it appears that if you collect all of the yellow letters it spells out "Thank You For Playing", and I hear that unlocks another mini-game.
I've gotten within one letter so far. Soooooo frustrating. So fun.