There's an obscure achievement in Episode Two, where you're asked to send a gnome into space. Which involves picking up that gnome at the very beginning of the game, and bringing it with you to the very end. If that sounds hard, it's not nearly as fiddly and challenging as you might imagine. And one Excellent Hero has made a photographic documentary of the journey.
PC Gamer's Tom Francis posts the adventure on his blog, explaining the tricks and tactics taken along the way, as well taking some absolutely hilarious photographs. Well worth a read.