About the most reliable method of doing in your head is to walk sober into a bar where a drunk is having an argument with a mirror.

Anyone with a passing interest in US politics has been doing that for the past year. A fair slice of the world's population did it again on Monday by tuning TVs or computers to what was billed as a "debate" between Donald Trump and Hillary Clinton.

There was Trump, altogether stewed on ego, arguing loudly with himself, a bit more vociferously than usual because, by rotten luck, the mirror had exposed him for what he has always been: a sleazebag.

There was only one thing for it. As always. He had to turn the tables. Find a victim.