It really, really burns me when people pronounce the "s" in Illinois. There's no "noise" in "Illinois."
The state capitol of Iowa is Des Moines - same thing, the "s" is silent. It's pronounced how it looks without the "s". But we always here Dez Moinez, Dez Moineeezzzzzz and other very bad ones! My mom who knew how it was pronounced always threw the last "s" on.
One of my sisters is married with the last name of "Diaz". A VERY common hispanic last name. She says she always knows when someone who doesn't know her calls because they mispronounce it ("DIE-AZE", "DAYS", "DEEZ", etc.). So her solution, "I'm sorry, no one by that pronunciation lives here!" Love it
My stepmother still answers the phone, "Yellow."...
a girl at work yesterday was complaining about how someone mis-pronounced something. She wanted them to "pronunciate." My boss informed her that is not a word. You "prounounce" or "Enunciate" you cannot "pronunciate."