well, seeing that you'll be in Wisconsin (and I've lived here most of my life)...
you might get a bit of that Northern Midwest "ya der hey" thing.
also, many people here call soda "pop" (which annoys the crap out of me!)
water/drinking fountains are "bubblers"
(another one I still find odd to use)
I know we have other ones, but those are the biggest ones that stand out to me.
