I came up with a good game, but I don't think I can post it in the Forum Games thread for reasons that will become obvious when I explain it. It doesn't matter that it would be huge fun, and give people the opportunity to jokingly do something that they have previously found annoying, and people would learn something, but it would have to go in PPR to die an unfunny death, so I may never give birth to:
The Gaslighting Game
You play by gaslighting the person above you. There are only a few basic moves, and the fun part is finding new ways to use them. You can create a false equivalence with something irrelevant, as long as it sounds vaguely possible. You can demand a detailed explanation of something that will be difficult to explain, or would waste a lot of the other person's time if the tried to explain it. You can put forward a nonsense explanation, as long as you sound confident enough about it. You can accuse the person of whatever you were just accused of, and even ramp it up a notch if you like. There are only a few more moves, and you win by not making it obvious which one you're using.
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"I find that the best way [to increase self-confidence] is to lie to yourself about who you are, what you've done, and where you're going." - Richard Ayoade