Nice! Even if "Sorry to burst your bubble, but this wasn't spontaneous. It was staged by a group of people similar to what 'Improv Everywhere' does." - @Freedo

Nice! Even if "Sorry to burst your bubble, but this wasn't spontaneous. It was staged by a group of people similar to what 'Improv Everywhere' does." - @FreedomUSA1 is correct, It's still a nice example of something gaining traction and taking off. (I wonder what pct of the ultimate crowd was "in on it" and how many joined once it'd been started.)