What are the worst example of autism you've had at your

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What are the worst example of autism you've had at your gaming table?

I've got several examples from over the years, not sure which one is the worst.

>Running a homebrewed world
>Vampires aren't undead here, but they do have a lot of the similar powerset.
>Mention it offhandedly in the worldbuilding packet, but don't really expect anyone to pay attention.
>Bring it up again when it actually becomes relevant to an adventure
>Sperglord flips out because Vampires HAVE to be undead, otherwise why would they drink blood?

>Players on an expedition, which is really more in the order of having a small army secure a set of ruins.
>They've got a bit over a hundred people behind them, although most are non-combatants.
>Chartered a ship to carry a bunch of the supplies, at least most of the way.
>Ship's name is "The Smiling Girl".
>Traveling along the coast
>Just say some stock description about how "The Smiling Girl dances along the waves as you travel, heading ahead of your column and then circling back, a pattern she repeats over the course of the day several times."
>But, The Smiling Girl's a ship, right? How can it dance?

>Player comes up with a stupid exploit based around blatantly misreading the rules to claim that his own trained sheep running around him in a circle are "threats" that he can use to provoke attacks of opportunity to combine with cleave to hit enemies after he murders the critters.
>Tell him that no, I'm not going to allow this to work.
>Heaps abuse on me before I ultimately boot him from the game, because apparently I'm a no fun allowed shitter GM.