You guys have hit on many of my wife's & my favorites in this thread already, but the up/down discussion gave me a reason to jump in.
I'm originally from Cajun country (SW Louisiana), and in addition to mixing in lots of French words when it's convenient, we also have some odd idioms that are literal translations from the French equivalent. One of these results in our "getting down" (from
descendre) from a car instead of "getting out". We also "save" dishes instead of putting them away, and New Orleanians "make" groceries instead of shopping for them.
I know these aren't really pet peeves, but I figured this would keep you from freaking out the next time you hear one of these.
WOW, I didn't realize this was my first post. I think I've started some others and never finished them. My bad.