Some people will say "small world" at any opportunity. If someone from Norwich knows someone from Norwich, that does not warrant it. If you're outside the Taj Mahal and...
Patrick M. replied:
On a dull note there's some fascinating statistical science about this kind of thing. http://en.m.wikipedia.org/wiki/Birthday_problem Obviously birthdays are a different area, but the concept remains the same.
Matthew P. replied:
Didn't you know? https://www.youtube.com/watch?v=EgQejd14 wKs