I've just realised that I don't think I've ever met a married couple who have the same birthday, or even heard of one. It shouldn't be that rare, should it?

So: do you have the same birthday as your partner?

@christianp
My uncle married a woman who has the same date of birth (so not just birthday) as him, and they also had the same last name even before they were married.

They only met because of their identical names and dates of birth, and also bad data modeling.

They both had insurance policies with an insurance company that identified its clients based on last name and date of birth, so they each regularly got mail intended for the other person.

@jozeldenrust wow! That has to be the winner for most coincidences.
@christianp depends on your definition of coincidence. Them having the same name, date of birth and insurance provider are all coincidences, but there's direct causation between those coincidences and them being married.