Burned, Baby, Burned examines the Watts riots of 1965:
The Watts riot began when white police officers stopped an intoxicated black driver in South Central Los Angeles. He resisted arrest and was forcibly subdued. A rumor quickly spread that the officers had beaten a pregnant black woman, and a growing mob started throwing rocks and bottles at the cops. The incident snowballed into a five-day conflagration, with blacks destroying a thousand businesses. Thirty-four people died, more than 1,000 were hospitalized and nearly 4,000 were arrested.
(Hat tip to 2blowhards.com.)