To the unobservant eye, Goat Simulator is simply about destroying things and causing chaos as a goat. But there's more to it, according to the developers.
(Ibrisagic is a developer at Coffee Stain Studios, the folks behind Goat Simulator, in case you're curious.)
Well then. That's...surprisingly heavy for such a goofy game. Mind, I'm pretty sure this is in jest — still, it's an amazing answer. Mind blown indeed.