Drake's Heavy Petting
Game: Uncharted 2: Among Thieves
In the Tibetan village (Chapter 16), you'll encounter what is either a series of yaks or a single stealthy-ass yak who's unimaginable fast. You can actually go up and pet them by pressing "X"—and if you rub all the yaks just right, you get a medal named after either Marshawn Lynch, Stu Scott's discarded catchphrase, or an upcoming Gears of War 3 multiplayer mode. Your pick!