Talking about getting "lucky" with your predictions
Back in the early 1900's, a guy named Edmund Creffield proclaimed himself "Joshua II", and started a cult in (where else?) the West Coast of the US. His followers were mostly women, and church meeting usually involved shedding all clothes and having an orgy.
When the angry husbands took him to trial in San Fransisco, he announced that God would pronounce judgement on the city.
The next day was April 18, 1906, and San Fransisco experienced the Great Earthquake with pretty much destroyed the city.
Of course, this pretty much cemented his power over his followers, this and a failed assassination attempt against him (the pistol repeatedly misfired.)
This is a link that gives more details about his cult :
http://www.pioneer.net/~mchumor/holyrollers_chap_5_pt1.html
I guess timing is everything!