Honestly, he has been out for a walk.
This is Joey having a bit of "me time". He doesn't usually do it when there are people in the room - we just hear the thumping noises from elsewhere in the house as he careers around the living room. It never lasts for very long either - as long as it takes for him to throw a stuffed toy behind the TV - which is about 30 seconds.
Something was bugging him tonight - not sure what - but he decided to go crazy when I had the camera to hand.