*January 21, 2006 - pacquiao beats erik morales, 13 days after (February 4, 2006) - wowowee stampede
The fight happened on January 22, 2006 on US time. Refer to wikipedia. That makes it 12 days not 13
*July 2, 2006 - pacquiao beats larios, 13 days after (July 15, 2006) - Mayon Volcano erupted
Mayon erupted July 14, again 12 days.
* October 6, 2007 - pacquiao beats barrera, 13 days after (Ocotber 19, 2007) - Glorietta Bombing
* March 15, 2008 - pacquiao beats marquez, 13 days after (March 28, 200

- rice shortage
A shortage does not occur on an exact date, this is a gradual decline of supply.
* November 14, 2009 - pacquiao beats cotto, 13 days afrer (November 27, 2009) - Mangudadatu successfully filed his certificate of candidacy at Shariff Aguak, in lieu of the Maguindanao massacre.. its so freaky...
The massacre took place on the 23rd. You're a week off.