One of my specialties that I run very rarely is a farcical parody one-shot I call the G.G. Scenario (because Gary Gygax traditionally appears as an NPC). I bring pre-generated characters that go into trials that sort of call out (in a humorous way) issues that we have at the table. So the bossy, "always calling the shots" player became the party's pack mule. The guy who always wants to try a new system five sessions into a campaign has to convert his character on the fly to a different game engine each turn to adapt to fight the monster. The guy always complaining about inappropriately balanced encounters had to solve a puzzle using encounter design math from the DMG.
It's not for everyone, but we've had good laughs over the years with it.
It's not for everyone, but we've had good laughs over the years with it.