You know what amazed me the most about this? Everyone more or less stayed facing the front of the class room as though they were expecting it (maybe they were). If it were me I would have turned so my eyes could follow the guy up the stairs. Too bad the teacher was not there to see it live.
The video is removed now but if someone like did that in class I'd just think it was a prank and wait for the punch line or whatever. No way I'd think it was something really happening like the new movie out Kick donkey.