Someone mentioned this one but I can't find it to quote but the 'Centre' vs. 'Center' debate.
I've seen that more for 'theatre' and 'theater' in the States. If memory serves, I believe it was explained to me that 'theater' involved movies and 'theatre' involved live performances.
I still don't understand, though, why the US spells metric words with an 'er' instead of 're' like the rest of the world, especially when it's not even used.


