Twice a year, Tokyo hosts Comiket--one of the largest fandom conventions in the world. On December 29 of this year, 150,000 people attended. On the 30th, 170,000 people showed up.
That's a lot of human bodies to move around. Managing crowd control safely on this scale is a refined science that looks like an artform when properly performed. This video from 2011 demonstrates why.
Here's one hour of human sardine processing displayed in photos taken every 5 seconds. That's really fast!
-via Twisted Sifter