Goat Simulator is a video game in which the player controls a goat. There does not appear to be any kind of storyline or plot. The player is free to explore the game's world as a goat, destroying things in the environment, running, jumping, and licking.
"Goat Simulator is like an old school skating game, except instead of being a skater, you're a goat, and instead of doing tricks, you wreck stuff," explained the game's creators. [source]
Oh, and it features a goat Iron Throne.
Sitting on the Infernal Throne turns the goat into King of the Goats and gives him the ability to "summon peasants" which makes goats rain from the skies.