Cops had to subdue some unruly fans at the A's game. This cop is giving the guy the old forearm bone on the windpipe trick--works well because of the discomfort, but bad, bad, bad for liability. On a real hyped-up guy, you'd have to crush the windpipe before you get any real results.
Of course, we all know the Right Way* to do this choke, yes?
*(Stick the guy's throat in the corner of your elbow joint, then squeeze the neck arteries with your bicep/forearm).