Here's what you need to know about Japanese dating event Machicon:

OK, so maybe there aren't any real mean streets here, but assault still happens. A grope on the MRT. An alcohol-fueled showdown. Fortunately you don't need to be able to pack much of a punch to take someone down, as Brazilian Jiu-Jitsu instructor Qin Yunquan showed us at a introductory training session at Kapap Academy. All you need to do, really, is to get your fingers in an attacker's face (under the nose, chin, or browbone) and tilt his head backwards sharply. If you do it right, he'll literally be floored before he knows what's going on.