Funny you should ask that,
Just yesterday I was at the local car wash, when a man came running past me on
the sidewalk, followed by a cop. Apparently the man was in the process of
fleeing a burglary and the cop was trying to catch him. Roughly ten feet away, the
cop caught him by the scruff of the neck, and the man spun around and took a swing at him.
The cop responded by doing what looked like Kotegaeshi (My eyes widened) the
man went down, and more units arrived. Later, I approached the cop and asked
him if he studied Aikido. He said yes, and he added that it comes in handy just about every week.
By the way, it was VERY effective.