Thankfully, I did not have to "bang a left" while visiting Boston this past week; I left all the driving to the expertise of the hacks (that way I didn't have to "pahk" a car either). I have no problem "hanging a left" or parking in Detroit but driving in Boston is a whole different animal.
Did I mention the dialect?
Here are some examples of phonetic differences between Boston and other American dialects from Boston English:
Vowel lengthens, different quality
/r/ replaced by schwa
Here is A Dialect Map of American English
The Boston English site also includes details about phonology and The Wicked Good Guide to Boston English includes information about the Boston lexicon.
It was a wonderful trip, no Boston Coolers to be found though.