If there are any other things that annoy you in the English language, common mistakes, common mispronunciations, or should I annoy you by saying pro-noun-ciations?
I've heard plenty of stories of kids who pick up the humorous mispronunciations from adults and go out into the world not knowing that only their family says it that way.
Mispronunciations win out over the centuries if enough people adopt them because they're easier to say or sound better or look like they should be pronounced a certain way.