It's not so scientific a question but it had always crossed my mind. I have met people from different regions of the country and different parts of the world. So much so that I can place people's accents now, somewhat!
And English being the common language, I have heard really funny accents from different people! A question that always haunted me about English (or about any other language) is:
WHO DECIDES HOW A WORD HAS TO BE PRONOUNCED???
This has reference, in particular, to languages that have loads of ambiguities, e.g., English!!!!! The set "gh" is pronounced as "f" as well as "gh"................who's the one who initially decides how the word has to be pronounced? And who "okays" the pronunciation?