I was in the US Air Force and stationed in England. If someone left their ID out we would hide it or freeze it in a block of ice. Your ID also happens to have your social security number on it. One of my coworkers left her ID on the table and when I grabbed it to go hide it, I noticed her social security number was only a couple of numbers off of mine. The first 8 numbers were completely the same.
For those not from the US, our socials are 9 digits long. The first 5 digits of your social security number indicates the part of the country you were born in. The last 4 digits are assigned from 0001-9999.
It turns out we were born in the same hospital 1 day apart, and met halfway across the globe 20 years later.