Hey.  Y'know what really grinds my gears?  When people pronounce the southern-most continent on our planet "Anartica".  This is so common.  Way more common than the correct pronunciation, and it drives me f*ckin' nuts. 

There are two t's and two c's in ANTARCTICA.   

And on that note, those same people drop the first c in arctic and say "artic".

Other mispronunciations that annoy me:

Wolf: "wuf"

Sandwich: "samwich"

Escape: "excape"

Especially: "expecially"

Espresso: "expresso"

Now, I'm actually rather famous among my friends and family for mispronouncing things on purpose for comedic effect, but I think what annoys me is when people mispronounce things, and they don't know they're doing it.  Something about that drives me up a wall.