Talk politics.

It never ends well when he decides to flip-flop between nonsensical interpretations of what other people say while accusing them of speaking gibberish. When I keep indicating to him that I'd like the conversation to end he keeps responding, so I figure I'll let him have the last word and think he 'won' or proved the 'gibberish' I was speaking as opposed to merely refusing to keep banging my head on a brick wall until I go blind.