This one unfolded in Rio de Janeiro on May 22, 2009. A robber figured he’d do his evil deed with a toy gun on a bus in the heart of the city that is a breeding ground for good (and bad, but leave them out of it, because they’re a minority) Jiu-Jitsu practitioners.
Upon discovery his weapon wasn’t real, the thug nearly succumbed to a guard player, and in the end the melée ended with a good old rear-naked choke delivering him safe and sound into the hands of the authorities.