Beat It

I was going through my iPhoto collection last night and I came across some interesting pictures and videos.

This one video I could not understand. We were closing out a rehearsal before an evening event. My son, who was 16 or 17 at the time was on bass.

And he started jamming on an MJ tune. Was it the hall? The balloons? What caused this bizarre behaviour?

What troubled me most is why I chose to encourage him by playing along. My amp never sounded the same after that song.