The following video was banned by YouTube, but not before some keen observers had first seen and recorded it.
Some arrogant little snot decides to pick on another schoolkid, who clearly doesn't want any part of it.
The bully taunts and punches the other kid, and you can hear his friends cheering him on.
Suddenly the other kid snaps.
It's like watching Gladiator in under 50 seconds.
Let this be a lesson to all bullies out there, be they kids, adults or even countries.