Tell me about a plot twist in your game (player or GM) that you didn't see coming.

A fantasy game years ago. The players learned there was a famine in the country, and the king was taxing almost all the food from everyone. Every month more food was taken, and the people were starving. There were rumors of people turning to dark arts, and demonic incursions, as well

So the players knocked some heads and eventually forced their way into the castle. They were ready to throw down with the evil king that was starving everyone to feed himself lavish feasts.

They discovered that the kingdom had drawn the attention of a large gluttony demon, and the king was feeding it all the food in order to keep it sated enough it wouldn't eat the people. No one among his people were powerful enough to banish the thing, and the demon told them if they told anyone the truth the deal was off.

Luckily, one of the player characters was pretty good at dealing with demons. After some tense "wait is he lying? This GM loves having NPCs just lie to us" they decided to trust the king, and had a big ass "everything is on fire and the wall are melting" fight with the demon.

Good times.

All the baddies of this large corpo were relentless cigarette smokers. Turns out they were actually smoke aliens in human balloon bags.