(This one is especially for Comrade PhysioProf)
No heavy theorizing here from me on this one. I think it's safe to say Brodie was doing this because it amused him. :P
Oh, and the Joni Mitchell song playing in the background has absolutely nothing to do with the visual content of the video. Matt just plays random MP3s all the time and that was just what happened to be on. More pleasant than the water heater going BANG BANG BANG at least!