it's a common belief that everyone has two things in common:
Everyone knows someone called Dave.
and Everyone knows someone who either owns a van, or can drive a van.
It's true for me. I have an uncle Dave, and there is a family freind who's a builder, so he has a van.
But does the rule hold true for everyone?
Do you know someone called Dave and do you know someone with a van?
or, do you even know a Dave who drives a van?
