There is nothing in the world more enjoyable than when someone is bluffing, and you have read them like a book and know they are bluffing. You toy with them, feign indecision; let them think for a bit they are going to get away with it. Then you look them dead in the eye, and you say without speaking "You are full of shit. And I have known it all along."
I rated it funny back then because it was obvious sarcasm… but now that I've learned that an acquaintance, who is an asshole but I believed reasonably intelligent, really supports Trump, I'm not so sure anymore. Poe's Law etc.