HarveyJ
He is - THE CACTUS!
damnit nn you beat me too it. I was going to call "staged" but not because of anything technical but because of the behavior of the people. In this day in age with all the people that snap and start killing everyone around them, there is no way ANYONE (that wasn't security)would have stuck around after the first monitor flew.
Listen to the language they're using in the 2nd clip filmed on a phone.
They're speaking Japanese.
A lady is screaming "Matte! Matte! Onegai!" --> "Stop! Stop! Please!"
Japanese people are pretttty docile, and ARE likely to actually stand around in shock if something like that happens.
By & large, Japanese people behave on ways we SERIOUSLY would not expect.
Being Japan also explains why the office is cheaply constructed.
Seriously, do an exchange program for a while. I accidentally fell through a WALL into my neighbours apartment when I did the JET thing for 3 months... My cubicle at the school was similarly of a cheaply constructed nature.