Everybody Freeze! [VIDEO]

So this group called Improv Everywhere puts together big, public, stunts and then puts them on the internet.  This one is awesome.  Check out how weird it is when 250 people freeze in place in the middle of Grand Central Station.

For whatever reason, if I saw this happen, I think I would flip out.  Like I would start yelling at the people or I would push somebody just to make them move.