The idea that celebrities die in groups of three has permeated popular culture. Of course the "Rule of Three" isn't based on any scientific evidence. There is no set time period or definition for who qualifies as a "celebrity." However, over the years there have been several occasions where a "Rule of Three" appears to be in effect. For example, Ed McMahon, Michael Jackson and Farrah Fawcett, died within a three-day span. Click through our slideshow to see where tragedy and coincidence have created famous "Rule of Three" triads.