That said, my favorite localization issues stem from CH/Switzerland. Numbers are formatted as 1'000.00 there (someone correct me), which is especially odd:
1) That's a weird decimal separator. DE uses a , and as far as I know FR uses a , as well. I _assume_ IT uses a , - so why is this a . in CH?
2) The ' really kills a lot of naive parsers and causes quite a bit of frustration in other fields (think OCR - some overly fat 1'000 might turn into a 11000 with bad luck/crappy image quality or (marginally better) lead to 1000 where means 'I think here's a character, but no clue what that might be')