Return culture shock

I was chatting with an Irish friend who has been living in Japan for over 15 years, and is now moving to the UK.  I asked him about whether he was experiencing any return culture shock after adapting so well to Japanese culture, and of course he had certain horror stories about the inefficiency of bureaucrats and bank employees.

One usually thinks about the culture shock one will experience when moving to a new environment, but what happens to us when we return to the old ones is something we tend to dismiss.

Now, how will I see Mexico when I go back next week after two years?