[Suicide Junkie]

Anyone who has this happen to them is almost certainly going to lose the game.

I'd give it a 5 if it was optional,
a 7 if it heavily depended on happiness,
and a 9 if the size of the rebellion depended on how big your empire is compared to everybody else. (Ie. if you're Last place, the rebellion is very minor, if you're first by a lot, then it could be up to half your empire)