Great American Vowel Shift

There is a phenomenon occurring called the Great American Vowel Shift. Basically, STOCK becomes STALK, BOX becomes BACKS. IT creates problems for emergency medical personnel that have to deal with the strange new pronunciations cause by a shifting of sounds.

You still hear people and the words they say, but they sound funny and in a noisy place it is easy to mess up and get the wrong idea. I believe that a time traveller from the future would have a "funny" foreign accent. This is because we are in the middle of the Great American Vowel Shift.