Well, since this video is making the rounds, I thought I might as well show it here too.
If you've seen motorcycle trials riders before, this may not seem so unusual but the setting is. Dougie Lampkin, 12 times world trials champion, invades a British mansion on his bike and proceeds to take it room to room, even up a spiral staircase. The occupants, with British aplomb, barely notice he's there even when the engine comes right next to their heads.
Obviously, a bit of planning was necessary here. Dougie did scout the place beforehand and plan a route that he could get through.
Certainly an entertaining video that I recommend.