On August 30, 1918, Fanny Yefimovna Kaplan shot and seriously injured Bolshevik leader Vladimir Lenin. Though certainly justifiable on some primary level — evil killers with power probably deserve to be killed in turn — 
this assassination attempt, like most such, had disastrous consequences, prompting the mass arrests and executions known as the Red Terror.
August 30, 1999, saw East Timor’s referendum vote for independence from Indonesia succeed.