OpenOffice has an autocorrect function – so, if you type shcool, it will silently fix it to “school”. No big deal, there.
It also has an option to select local language variant – so you can autocorrect honour to honor or vice versa.
It then turns out it does it with vocabulary. Um.
Set it to UK English, start writing in an American register, and “sidewalk” becomes “pavement”. “Zip code” becomes “postcode”. Thankfully these are the only two examples I’ve found, but – really. Who on earth though that was a sensible idea to implement? If someone’s writing with American vocabulary as opposed to simply spellings, despite having a different dictionary set, they probably mean to do so…