To me? Mary, Merry and Marry are all pronounced exactly the same.
And I call it pop, not soda. But once in awhile I catch myself saying soda. Woops!
People give me a hard time for the way I say "milk." I say "Melk" but that's how we said it in Colorado.
And of course, the whole duck, duck, goose/grey duck thing.
I don't think there's any doubt that this sandwich is a Sub, but when I was a kid in Colorado we called it a Hoagie. I think that term has kind of died out, and apparently almost NO one calls it a hero anymore!