It would have to be something pretty awful like the zombie apocalypse since I smelled enough tear gas to last a lifetime while I was stationed in Seoul, South Korea for back to back tours. Unlike me, they'd riot almost daily over every little imaginary slight like the United States wanting to make them our 51st state. Seriously, there were people that believed that living there!!!
The ongoing breach of human rights in Syria and the apparent lack of interest/compassion shown by the rest of the world.
Riots are pretty violent and, I'm really not one for violence, but it angers me beyond the point of reason.
I would want to right for women's rights.