@Setanta,
One big similarity I found was in stagger pattern.
1978, Benidorm, 2.30am, I was staggering back from a German disco (true story) after losing my mates, when I saw what turned out to be a Glaswegian staggering the other way.
There was a chequerboard style pavement, about thirty feet wide, and we were the only two around.
After several changes of approach stagger, we both realised that our major changes in direction actually mirrored each others exactly, and we smacked into one another.
We stood there rubbing our bumped bits for a few seconds, he offered me a fag (cig), I took it, then we both lit up and grinned drunkenly at each other.
We shook hands, had a man hug and staggered on our way.
Synchronised stagger could cure a lot of problems around the world, I think.