That's funny. Emergent surprises in RPGs are amazing - I still think they are the most creative kind of game.
A long time ago I ran a Paraonia XP game.. and one particular player was late to the party. It was everyone's first time playing and they were hyped at the mystery & chaos of secret societies and mutant powers.
Player arrived in a climactic battle scene - one clone dead, one incapacitated, an R&D weapon misfiring and mutant pyrokinesis igniting the Team Leader..
I had a lot to run as a GM including passing note cards back and forth for secret actions. Party's telling Player how crazy the game is and "we all have mutant powers" etc.. I rolled for a secret-society, then for mutant power.. I went blank, wanting to give one that meshed with the rest for hiliarity but didn't have the focus, so I just wrote down "you don't have one." on a note card and passed it to him.
This led to paranoid confusion as Player was thrust into dangerous combat, with Party urging him to activate his mutant power to save his life and him panicking "I don't have one!" and Party believing he's just Role-Playing. If I was a good GM I would have tossed him some Perversity Points, I hope I did.
He died in a molten inferno from a traitorous mutant's pyrokinesis.
(His next clone did get a mutant power
)