according to my
http://www.livejournal.com/birthdays.bml there are 87 unique person-birthdays;
there are four birthdays on 11/11/xx;
there are three birthdays on 10/20/xx (I counted four until "Oh Wait Hey Car Has At Least Two LJs");
there are three birthdays on 11/25/xx;
there are three birthdays on 06/19/xx;
there are three birthdays on 05/18/xx.
According to these- and only these- data,
You have an 18.4% chance to have been born on one of those five days.
Divide that by five and you get a 3.68% chance to have been born on one of those days.
However, in a completely-random, completely-equal-chanced sort of system, you'd only have a 0.274% chance to be born on a given day.
So with this data set, the five days I listed above have a 13.43-times-greater "birth-happening-chance" than would be predicted by a completely random model.
87 is a small sampling of data-points for a system which allows for 365.25 different outcomes,
but I'd say that that 13.43 is a pretty significant figure.
So, uh,
happy birthday, kids c.c
YOU FELL INTO THE BLACK HOLE OF SCIENCE.