"... stumble out of a pub..."
Like the inebriated gentleman in San Francisco of many years ago? He stumbled out of a pub, crawled into the back seat of a waiting automobile, assuming it was a taxi, and demanded "Take me to the corner of Washington and Clay!" Given that Washington and Clay run parallel to each other, that would confuse the hell out of the computer.
In this case, however, the officers driving the vehicle escorted their new passenger to the lockup so he could sleep it off.