Once Skyrim was complete, Bethesda gave every team member a week to do literally anything they wanted using the engine. This orgy of creativity is known as a Game Jam, and it resulted in content that I frankly wish was in the release build. Werewolf skill trees! Flying Vampires! Dragon riding! Mounted combat! Kinect shouts that put your voice into the game! F*cking wereBEARS!
Bethesda has handily wrapped this all up into an eyewatering highlights reel, which we've embedded after the break. It will be interesting to see whether any of these features make it into DLC or get emulated by the community now that the Creation Kit is available.